Boston Terriers have 28 deciduous teeth as puppies and 42 permanent teeth as adults, but fitting a full set of adult teeth into a short, brachycephalic jaw can make dental care especially important for this breed. Their compact muzzle leaves less space for tooth alignment, which can contribute to crowded or crooked teeth and create areas where plaque and tartar are harder to remove.
A Boston Terrier starts developing baby teeth during the first weeks of life and later replaces them with permanent teeth during puppyhood. Most of this process occurs naturally, but retained baby teeth, abnormal tooth positioning, and bite problems can require veterinary attention. Dental health also becomes increasingly important after the permanent teeth emerge because accumulated plaque can progress to gum inflammation and periodontal disease when it is not controlled.
Understanding what normal Boston Terrier teeth look like makes it easier to recognize changes that require attention. This guide covers the number and types of teeth Boston Terriers have, their teething process, crowded teeth and underbites, common dental problems, warning signs, tooth brushing, dental chews, diet, and veterinary dental care.
How Many Teeth Do Boston Terriers Have?
Adult Boston Terriers have 42 permanent teeth, while Boston Terrier puppies have 28 deciduous, or baby, teeth. The permanent set consists of 12 incisors, 4 canines, 16 premolars, and 10 molars. These teeth perform different functions during eating, chewing, and handling objects.
The 12 incisors are the small teeth at the front of the mouth. Boston Terriers use them to bite and remove small pieces of food and to perform precise actions such as nibbling during grooming. Four canine teeth sit beside the incisors and have longer, pointed crowns designed for gripping and tearing. The 16 premolars are positioned farther back along the upper and lower jaws and help cut and break down food. The 10 molars occupy the rear portion of the mouth and provide broader surfaces for crushing food before swallowing.
Boston Terrier puppies have fewer teeth because their deciduous set does not contain molars. Their 28 baby teeth consist of 12 incisors, 4 canines, and 12 premolars. These temporary teeth occupy the mouth until the permanent teeth develop and replace them during the teething period.
The number of teeth is the same basic dental pattern found in other adult dogs, but their arrangement deserves attention in Boston Terriers. The breed has a short muzzle and compact jaw associated with its brachycephalic skull shape. Permanent teeth therefore need to fit within relatively limited jaw space, which can affect tooth positioning. A Boston Terrier can consequently have the expected number of teeth while still having crowded, rotated, or irregularly positioned teeth.
When Do Boston Terrier Puppies Lose Their Baby Teeth?
Boston Terrier puppies begin losing their baby teeth as their permanent teeth erupt during puppyhood, with the transition generally occurring between about 3 and 7 months of age. The incisors are among the first teeth to be replaced, followed by the canine teeth and premolars, while permanent molars erupt without replacing baby teeth. By the end of the normal teething period, the puppy should be transitioning toward its complete set of 42 permanent teeth.
Teething occurs because developing permanent teeth move into position and contribute to the loss of the deciduous teeth above them. Owners may find a small tooth on the floor or attached to a toy, but many lost puppy teeth are never noticed. A puppy can swallow a deciduous tooth while eating or chewing without the owner seeing it fall out.
Chewing usually increases during this stage because eruption of the permanent teeth can create gum discomfort. A Boston Terrier puppy may chew toys, bedding, furniture, or other available objects more frequently. Owners can provide appropriately sized puppy-safe chew toys and monitor the mouth for abnormal changes rather than attempting to pull loose baby teeth themselves.
Minor gum sensitivity can accompany normal teething, but persistent pain, substantial bleeding, difficulty eating, facial swelling, or an abnormal-looking tooth warrants veterinary attention. Monitoring is particularly useful for Boston Terriers because limited space within the jaw can make the position of both retained and newly erupted teeth important.
What Happens If a Boston Terrier Keeps Its Baby Teeth?
A Boston Terrier that keeps a baby tooth after the corresponding permanent tooth erupts has a retained deciduous tooth. Instead of the temporary tooth falling out as expected, both teeth can occupy the same area of the mouth. Canine teeth are an especially noticeable example because owners may see two teeth positioned closely together where they expect to see one.
A retained baby tooth can alter the position of the developing permanent tooth and reduce the space between neighboring teeth. Closely positioned teeth also create narrow areas where food debris and plaque can accumulate. This makes effective brushing more difficult and can contribute to inflammation around the affected teeth.
Retained teeth should be evaluated by a veterinarian rather than treated at home. The veterinarian can determine whether the deciduous tooth is actually retained, assess the position of the permanent tooth, and decide whether extraction or another intervention is appropriate. Early assessment is particularly useful when the retained tooth is changing the permanent tooth’s position or causing contact with the gums or other oral tissues.
Why Do Boston Terriers Have Crowded or Crooked Teeth?
Boston Terriers can have crowded or crooked teeth because their short, brachycephalic muzzle provides limited jaw space for the permanent teeth. An adult Boston Terrier still develops the standard canine dentition of 42 permanent teeth, but those teeth must fit within a relatively compact mouth. When available space is limited, individual teeth can erupt at an angle, rotate, overlap neighboring teeth, or sit unusually close together.
Crowding matters for more than appearance. Teeth positioned close together create narrow spaces that are difficult to reach with a toothbrush. Plaque can remain around these areas and along the gumline, where bacteria contribute to inflammation. As plaque mineralizes into tartar, the irregular arrangement of the teeth can make effective home cleaning even more difficult. This is one reason owners should inspect the entire mouth rather than judging dental health only by the visible front teeth.
Crooked teeth do not automatically require treatment. The functional effect of their position is more important than whether every tooth appears perfectly straight. A veterinarian should assess a tooth when its position causes pain, damages the gums or other oral tissues, interferes with normal chewing, traps substantial debris, or creates another dental problem. This distinction prevents normal anatomical variation from being treated as disease while still identifying tooth positions that can compromise oral health.
Retained deciduous teeth can further reduce available space. When a permanent tooth erupts before its corresponding baby tooth falls out, both teeth may compete for the same area. The permanent tooth can then develop in an abnormal position. Checking tooth alignment during the puppy teething period helps owners identify this problem before the adult dentition is fully established.
Do Boston Terriers Have an Underbite?
Boston Terriers can have an underbite, a type of bite relationship in which the lower teeth or lower jaw extend farther forward than the upper teeth when the mouth is closed. Bite alignment is influenced by the relationship between the upper and lower jaws as well as the position of individual teeth. Because the Boston Terrier has a short muzzle and brachycephalic skull structure, owners may notice a bite that looks different from the alignment seen in longer-muzzled breeds.
An unusual-looking bite is not automatically a painful dental condition. The important distinction is whether the teeth can function without injuring the mouth. A Boston Terrier may have visible differences in tooth or jaw alignment while continuing to eat, chew, and close its mouth normally. In these cases, appearance alone does not establish that treatment is necessary.
A bite becomes more concerning when abnormal tooth contact damages oral tissues. For example, a canine tooth positioned incorrectly may contact the palate, gum, lip, or another tooth each time the dog closes its mouth. Repeated contact can produce irritation, wounds, pain, or abnormal tooth wear. Severe malocclusion can also interfere with picking up food or chewing comfortably.
Owners should therefore pay attention to function and tissue contact rather than trying to diagnose a Boston Terrier’s bite from appearance alone. Difficulty eating, reluctance to chew, oral bleeding, visible wounds, repeated contact between a tooth and soft tissue, or signs of mouth pain justify a veterinary dental examination. A veterinarian can assess both jaw alignment and individual tooth position to determine whether the bite is simply an anatomical variation or a problem requiring treatment.
What Dental Problems Are Common in Boston Terriers?
The main dental problems that can affect Boston Terriers include crowded teeth, retained baby teeth, plaque and tartar buildup, gingivitis, periodontal disease, and damaged or loose teeth. Several of these problems are connected. Crowded or closely positioned teeth can make plaque removal more difficult, while persistent plaque at the gumline can initiate inflammation that progresses into more serious periodontal disease.
Plaque is a bacterial film that develops on tooth surfaces. When it is not removed effectively, minerals in the mouth can harden the plaque into tartar, also called dental calculus. Tartar is easier for owners to see because it can form a yellow or brown deposit on the teeth, particularly near the gumline. Brushing can help control plaque before it mineralizes, but established tartar generally requires professional veterinary dental care rather than aggressive scraping at home.
Gingivitis develops when plaque-associated bacteria and inflammation affect the gums. Owners may notice redness, swelling, or bleeding around the gumline. Gingivitis is important because inflammation at this stage involves the tissues surrounding the teeth and can progress if the underlying dental problem continues. Persistent bad breath can occur alongside these changes and should not automatically be dismissed as normal dog breath.
Broken and loose teeth require separate attention because they can indicate trauma or underlying dental disease. A fractured tooth can expose deeper structures and become painful, while a loose permanent tooth can indicate loss of supporting tissue around the tooth. Signs such as chewing on only one side, dropping food, avoiding hard objects, or reacting when the mouth is touched can accompany painful dental problems even when the affected tooth is difficult to see.
Are Boston Terriers at Risk of Periodontal Disease?
Boston Terriers can develop periodontal disease when plaque-associated inflammation progresses from the gumline into the tissues supporting the teeth. The process generally begins with plaque accumulation. Continued bacterial activity triggers gingival inflammation, and progression can damage the periodontal ligament and supporting bone that hold a tooth in place.
The progression can be understood as plaque accumulation → gingivitis → deeper periodontal damage → loss of tooth support. Once the supporting structures are damaged, a permanent tooth can become mobile and eventually be lost or require extraction. Periodontal disease therefore involves more than visible tartar on the tooth crown; important damage can occur beneath the gumline where owners cannot evaluate it accurately at home.
Crowded teeth can complicate plaque control because closely positioned or rotated teeth create surfaces that are harder to brush. This does not mean that every Boston Terrier with crooked teeth will develop periodontal disease. It means that tooth position should be considered when establishing an oral-care routine and when a veterinarian examines the mouth.
Prevention focuses on controlling plaque and identifying dental disease before extensive supporting tissue is lost. Regular tooth brushing, routine inspection of the mouth, and veterinary oral examinations work together for this purpose. Professional dental cleaning and treatment may be necessary when disease is present, particularly because an external inspection cannot reveal the full condition of structures beneath the gumline.
What Are the Signs of Dental Problems in Boston Terriers?
Eight important signs of dental problems in Boston Terriers are persistent bad breath, visible tartar, red gums, bleeding gums, difficulty chewing, dropping food, loose or broken teeth, and facial swelling. These signs differ in severity, but each can indicate that the mouth needs closer examination rather than routine cleaning alone.
Persistent bad breath can accompany plaque accumulation and gum disease, while yellow or brown deposits near the gumline can indicate tartar. Healthy-looking gums should not repeatedly bleed during ordinary eating or gentle oral care. Redness, swelling, or bleeding around a tooth can indicate inflammation and deserves attention, particularly when the change persists.
Changes in eating behavior can reveal dental pain that is not immediately visible. A Boston Terrier with an uncomfortable tooth may chew on one side of its mouth, hesitate before taking hard food, drop food while eating, avoid chew toys, or resist having its face and mouth handled. These behavioral changes matter because dogs cannot identify the painful tooth for their owners, and significant dental disease can exist behind the lips or beneath the gumline.
Loose permanent teeth, fractured teeth, substantial oral bleeding, and facial swelling are more concerning findings. Facial swelling can occur when a dental problem affects tissues beyond the visible portion of a tooth. Owners should not attempt to pull a loose permanent tooth, repair a fractured tooth, or treat swelling by relying on home dental products. These findings require veterinary assessment to determine the underlying cause and appropriate treatment.
When Should You Take a Boston Terrier to the Vet for Dental Problems?
Take a Boston Terrier to the veterinarian when dental changes persist, cause pain, interfere with eating, or involve damaged teeth, bleeding, or facial swelling. Mild plaque accumulation and routine oral hygiene can be addressed through preventive dental care, but owners cannot diagnose problems below the gumline or determine the condition of a tooth’s root through visual inspection alone.
Persistent bad breath, increasing tartar, red gums, and recurring gum bleeding justify a dental examination because these changes can accompany gingivitis or periodontal disease. Waiting until a tooth becomes loose can allow disease to progress from superficial gum inflammation to damage involving the structures supporting the tooth. A veterinarian can examine the mouth and determine whether home plaque control remains appropriate or professional dental treatment is required.
More urgent assessment is appropriate when a Boston Terrier has facial swelling, substantial oral bleeding, an obviously fractured tooth, severe mouth pain, or difficulty eating normally. A dog that suddenly refuses food or reacts strongly when its mouth is touched may have an oral problem that cannot be identified from the visible tooth surfaces alone. Broken teeth also require assessment even when the dog continues eating because the extent of the fracture determines which internal tooth structures are affected.
Puppies should also be examined when a permanent tooth erupts while the corresponding baby tooth remains firmly in place. Retained deciduous teeth can alter permanent tooth positioning and create additional plaque-retaining spaces. Owners should not attempt to extract these teeth themselves because the complete tooth, including its root and relationship with the developing permanent tooth, needs to be considered.
How Do You Clean a Boston Terrier’s Teeth?
Clean a Boston Terrier’s teeth by brushing the tooth surfaces and gumline regularly with a dog toothbrush and toothpaste formulated specifically for dogs. Brushing mechanically disrupts plaque before it accumulates and mineralizes into tartar. Because crowded or rotated teeth can create difficult-to-reach surfaces in a Boston Terrier’s compact mouth, brushing should cover more than the easily visible front teeth.
Start by getting the dog comfortable with having its lips and mouth handled. Introduce oral contact gradually, then progress to a dog toothbrush or another veterinary-appropriate brushing tool. Lift the lip to access the outer tooth surfaces and use gentle movements around the gumline, where plaque commonly accumulates. Pay particular attention to crowded areas and the rear teeth rather than repeatedly brushing only the incisors at the front of the mouth.
Use toothpaste designed for dogs rather than human toothpaste. Dogs swallow much of the toothpaste used during brushing instead of rinsing and spitting it out. Human oral-care products are not formulated around this behavior, so dog-specific products are the appropriate choice for routine brushing.
Daily brushing provides the most consistent home plaque control when the Boston Terrier tolerates it. Building the routine gradually is more useful than forcing a long brushing session that makes the dog resist future attempts. A puppy can be introduced to gentle mouth handling before its permanent teeth are fully established, allowing tooth brushing to become a familiar part of normal care.
Brushing has limits. It helps control plaque on accessible tooth surfaces but does not remove established disease beneath the gumline or correct loose, fractured, retained, or abnormally positioned teeth. Visible tartar should not be aggressively scraped from a Boston Terrier’s teeth at home. A dog with significant tartar, inflamed gums, pain, or other signs of dental disease should receive a veterinary dental assessment.
Do Dental Chews Help Keep Boston Terrier Teeth Clean?
Dental chews can help reduce plaque and tartar mechanically as a Boston Terrier bites and chews them, but they should supplement rather than replace tooth brushing and veterinary dental care. Their cleaning effect depends on the product contacting tooth surfaces during chewing, so simply giving a chew does not provide the same control over plaque removal as directly brushing accessible teeth.
Choose a dental chew that is appropriate for the Boston Terrier’s body size and chewing behavior. A product that is swallowed rapidly has little opportunity to produce mechanical cleaning, while an unsuitable chew can create choking or tooth-injury risks. Supervision is particularly important when introducing a new product because individual dogs differ in how aggressively they chew and whether they attempt to swallow large pieces.
Dental chews also cannot correct existing structural or medical problems. A chew will not remove a retained baby tooth, reposition crowded teeth, repair a fracture, or treat advanced periodontal disease. Hard chewing can also be inappropriate for a dog with an already painful or damaged tooth. Owners should therefore treat dental chews as one component of preventive oral care rather than as treatment for visible dental disease.
A practical dental routine combines methods that perform different functions: brushing disrupts plaque on accessible surfaces, appropriate dental products can provide supplementary mechanical cleaning, and veterinary examinations identify problems that cannot be evaluated or treated at home. This combination is especially useful for Boston Terriers with crowded teeth because plaque control needs to account for areas where individual teeth sit unusually close together.
Does Diet Affect a Boston Terrier’s Dental Health?
Diet affects a Boston Terrier’s dental health because food and chewing behavior influence how material interacts with the teeth, but diet does not replace direct plaque control. A complete dental-care routine should therefore treat nutrition and chewing as supporting factors rather than assume that a particular type of everyday food will keep the teeth clean.
Food can remain around closely positioned teeth and along the gumline, particularly when tooth crowding creates spaces that are difficult to clean. Plaque forms on tooth surfaces regardless of whether the teeth appear visibly dirty after a meal. For a Boston Terrier with crowded or rotated teeth, these less accessible areas deserve particular attention during brushing and routine oral inspection.
The physical characteristics of food should also not be confused with proven dental cleaning. Eating dry food does not automatically provide sufficient mechanical action to clean every tooth or prevent periodontal disease. The amount of contact varies according to the food, tooth position, and how the individual dog chews. A Boston Terrier that quickly breaks and swallows pieces may receive little cleaning action on surfaces where plaque accumulates.
Chewing products specifically intended for dental care can provide additional mechanical cleaning, but they still serve a different function from a balanced diet. Owners should select food primarily to meet the dog’s nutritional needs and manage dental health through dedicated oral-care practices, including brushing, appropriate dental products, and veterinary examinations.
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How Often Should Boston Terriers Have a Dental Checkup?
Boston Terriers should have their teeth and gums examined as part of routine veterinary care, while the need for professional dental cleaning should be determined from the condition of the individual dog’s mouth. There is no single cleaning interval that accurately reflects every Boston Terrier because plaque accumulation, tooth alignment, age, home brushing, and existing periodontal disease can differ between dogs.
A routine oral examination allows the veterinarian to look for tartar, gum inflammation, retained teeth, fractured teeth, abnormal tooth positions, and other visible changes. Regular assessment is useful even when owners brush at home because parts of the mouth are difficult to inspect thoroughly, especially around crowded rear teeth. Dental abnormalities identified during puppyhood can also be monitored as the permanent dentition develops.
Professional dental cleaning serves a different purpose from a basic visual examination. When clinically indicated, veterinary dental procedures allow plaque and calculus to be addressed more thoroughly, including areas that cannot be cleaned effectively with a toothbrush at home. The veterinarian can also evaluate whether additional diagnostic or dental treatment is required when disease is suspected beneath the gumline.
The appropriate timing therefore depends on dental findings rather than the calendar alone. A Boston Terrier with minimal plaque and consistent home dental care may have different needs from a dog with crowded teeth, substantial tartar, gingivitis, or previous periodontal disease. Owners should use routine veterinary examinations to establish an individual dental-care schedule instead of waiting for severe bad breath, loose teeth, or difficulty eating before seeking care.
How Can You Keep a Boston Terrier’s Teeth Healthy?
Keep a Boston Terrier’s teeth healthy with consistent plaque control, regular mouth inspections, appropriate chewing products, routine veterinary examinations, and timely treatment of dental abnormalities. These measures address different stages of dental health, from preventing plaque accumulation to identifying problems that cannot be managed at home.
Brush the teeth regularly with dog-safe toothpaste and pay particular attention to the gumline, rear teeth, and crowded areas. Home inspection should look for changes such as increasing tartar, red or bleeding gums, persistent bad breath, fractured teeth, retained puppy teeth, and unusual tooth positioning. Detecting a change early allows the owner to arrange veterinary assessment before a painful problem becomes more advanced.
Use dental chews and other appropriate dental products as supplements when they suit the dog’s size and chewing behavior. These products can add mechanical cleaning, but they should not replace brushing or be used to treat an already painful tooth. Nutrition should likewise support the Boston Terrier’s overall health without being treated as a substitute for dedicated oral hygiene.
Veterinary dental care completes the preventive routine. A veterinarian can assess bite alignment, retained teeth, periodontal health, fractures, and structures that owners cannot adequately evaluate at home. This is particularly important when a Boston Terrier develops facial swelling, difficulty eating, significant gum inflammation, loose permanent teeth, or signs of oral pain.
Maintaining healthy Boston Terrier teeth is therefore an ongoing process rather than a response to visible tartar alone. Consistent home plaque control combined with veterinary assessment provides the foundation for protecting the teeth, gums, and supporting structures throughout the dog’s life.
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