Your kitten was toothless when you brought her home. Then, seemingly overnight, she has a full set of tiny, needle-sharp teeth she's testing out on your fingers, your furniture, and anything else within reach. A few months later, you find an actual tooth on the floor and suddenly you're wondering if this is normal, or something to call the vet about.

Cats grow two full sets of teeth in their lifetime a temporary "baby" set that erupts in kittenhood, followed by a permanent adult set and understanding this timeline helps you catch problems early, while they're still easy to fix. Each type of companion animal has its own unique type of teeth, depending on what type of food the animal normally eats. However, all domestic animals have 2 sets of teeth during their lives, as humans do: a set of deciduous ("baby") teeth that fall out, and a set of permanent teeth that come in later. This guide walks through exactly when each tooth type appears, what's normal to notice along the way, and where things can go wrong.

Kittens are born without teeth. Their baby (deciduous) teeth begin erupting around 2 to 4 weeks of age, and by 8 weeks most kittens have a full set of 26 baby teeth. Starting around 4 months, these baby teeth begin falling out to make way for permanent adult teeth, and by 7 months most cats have their complete set of 30 permanent teeth. Watching this timeline matters because problems like retained baby teeth, a misaligned bite, or delayed eruption are far easier to correct while a kitten is still young.

Key Takeaways

• Most cats have 26 deciduous teeth and 30 permanent teeth.
• Deciduous incisors begin to erupt at 2 to 4 weeks of age, and deciduous premolars at 5 to 6 weeks of age.
• Permanent teeth usually begin to appear at around 4 to 7 months of age.
• Dental development can be divided into 3 stages: Stage 1 is from 0 to 16 weeks of age, Stage 2 is from 16 weeks to 7 months of age, and Stage 3 is from 7 months to 1½ years of age.
• If persistent baby teeth are removed by a veterinarian as soon as they are noticed, complications can usually be prevented.
• Cats do not develop cavities like those seen in humans, but a different condition tooth resorption is their most common dental problem instead.

Kitten Teeth: The First Set

The deciduous incisors begin to erupt at 2 to 4 weeks of age, and the deciduous premolars at 5 to 6 weeks of age. Kittens are born completely toothless this is normal, since their only food source in the first few weeks is their mother's milk. By around 8 weeks old, most kittens have their full set of 26 baby teeth in place.

During this stage, you'll likely notice your kitten chewing on everything toys, fingers, furniture edges. This is a normal response to the discomfort of new teeth cutting through the gums, and it's worth giving kittens safe things to chew on rather than trying to stop the behaviour altogether.

Adult Teeth: The Permanent Set

Permanent teeth usually begin to appear at around 4 to 7 months. This is the point where baby teeth start falling out you may find small teeth on the floor, in bedding, or notice your kitten simply swallows them during meals, which is completely harmless.

The four molars are new additions in the adult set kittens never have molars among their baby teeth, since the first premolar and the molars do not have deciduous counterparts. These nonsuccessional teeth develop directly from the dental lamina in the caudal portion of the arch. By around 7 months of age, most cats have their complete adult smile.

The Three Stages of Dental Development

Veterinary dentists find it useful to think about a cat's mouth development in three distinct windows, because each stage carries its own specific risks and opportunities for early intervention.

Dental development can be divided into 3 stages: Stage 1 is from 0 to 16 weeks of age, Stage 2 is from 16 weeks to 7 months of age, and Stage 3 is from 7 months to 1½ years of age.

Stage 1 (0–16 weeks): The overbite/underbite window. Kittens are born with relatively long upper jaws ("overbite"), which allow them to nurse. As the kitten grows and begins to eat solid food, the lower jaw goes through a growth spurt. If certain of the lower baby teeth come in before the growth spurt, they can get caught behind the upper teeth and prevent the lower jaw from developing to its proper length. The usual treatment is to remove several of the baby lower teeth. This will allow the lower jaw to reach its full length and avert problems with the permanent teeth.

The reverse situation can also occur. In these cases, the lower jaw grows faster than usual and becomes too long for the upper jaw, producing an "underbite." This condition can be detected as early as 8 weeks of age. As with the overbite scenario, certain teeth from the upper jaw may become caught behind those of the lower jaw, preventing proper growth of the upper jaw, and the treatment is usually to extract several teeth — in this case, upper teeth.

Stage 2 (16 weeks–7 months): The retained baby teeth window. The most important problem that can occur during this stage is the persistence of baby teeth. Abnormal tooth position and bite may result if the baby teeth are not lost at the time the corresponding permanent teeth are coming in. If persistent baby teeth are removed by a veterinarian as soon as they are noticed, complications can usually be prevented.

Another developmental defect noted in this stage is abnormal positioning (tilting) of the upper canine teeth. Depending on the specific situation and age of the cat, orthodontic treatment (that is, "braces" for your pet) can be used to align teeth in their correct positions. This treatment is only effective in some cats. In most cases, tooth shortening or extractions might be necessary.

Stage 3 (7 months–1½ years): The crowding window. Additional types of incorrect tooth placement and crowding of teeth can occur during this stage of your pet's growth. Treatment, if necessary, may include orthodontic treatment and possibly tooth extraction.

"Early detection and intervention is the best way to prevent more serious problems later in the cat's life." — Merck Veterinary Manual, Dental Disorders of Cats

What Can Go Wrong Along the Way

Retained deciduous teeth. This is the single most important thing to watch for during Stage 2. A baby tooth that hasn't fallen out by the time its adult replacement is erupting can force the permanent tooth into the wrong position and unlike in humans, this doesn't self-correct. A vet needs to extract the retained baby tooth promptly.

Extra teeth (polyodontia). In cats, extra teeth sometimes occur and may lead to crowding and poor alignment of the teeth. Extra teeth that cause crowding should be extracted by a veterinarian as soon as they are discovered to prevent further dental problems.

Enamel defects. Abnormal development of tooth enamel can be caused by fever, trauma, malnutrition, poisoning, birth defects, or infections. Affected teeth are prone to plaque and tartar accumulation, which lead to tooth decay. One important note for anyone with a pregnant queen or very young kittens: giving tetracycline antibiotics to pregnant females or to kittens less than 6 months old may result in permanent brownish-yellow stains on the teeth.

Common Dental Disorders in Adult Cats

Once your cat's permanent teeth are all in, the story shifts from development to maintenance. A few conditions come up often enough to be worth knowing well before they happen.

Tooth resorption (cervical line lesions). Cats do not develop cavities like those seen in humans. However, they may develop resorptive lesions (also called cervical line lesions or feline odontoclastic resorptive lesions). In fact, these are the most frequently seen dental abnormality in cats. The condition results in the breakdown and loss of tooth material and is often associated with bright red, inflamed gums. Signs associated with cervical line lesions include pain on contact, loss of appetite, drooling, and generally not feeling well. Because cats are good at hiding pain, you may not notice any signs. In most cases, affected teeth will need to be extracted. Most resorptive lesions cannot be prevented because the cause is usually unknown.

Gum disease (gingivitis and periodontitis). Gum disease is infection and inflammation of the tissue surrounding the teeth, caused by the accumulation of bacterial plaque at and below the gum line. In gingivitis, the gums become inflamed because of bacterial plaque, but the ligaments and bone are not yet affected. A form of juvenile-onset gingivitis is seen in some cats at 6 to 8 months of age. Left untreated, gingivitis may lead to periodontitis, in which the tissue damage is more severe and includes the gums, the ligaments, and bone. It is irreversible and results in permanent loss of tooth support. In some cats this disease can be seen as early as 1 year of age.

Why plaque matters so much. Plaque is a thin film of food debris, bacteria, saliva, and dead cells that is continually deposited on your animal's teeth. Plaque that is present for more than 72 hours begins to harden into a substance called tartar (calculus) that accumulates at the base of the teeth. This buildup irritates the gums and contributes to the development of gum disease. This 72-hour window is exactly why a "brush a couple of times a week" routine genuinely helps, even if daily brushing isn't realistic for every cat.

How to Support Healthy Tooth Development

The most important point to remember is that gum disease rarely develops around clean teeth. At-home methods to keep your pet's teeth clean, such as toothbrushing, along with regular dental examinations, are the best ways to help prevent gum disease.

• Start early, before adult teeth are even fully in. Getting a kitten used to having their mouth handled during the baby-teeth stage makes brushing far easier once the permanent teeth arrive.
• Brush your cat's teeth every day if possible. Plaque that remains on the teeth for more than 3 days turns into a hard material that cannot be removed by a toothbrush.
• If your cat does not allow toothbrushing, try at least to wipe the teeth with a gauze pad every 2 to 3 days.
• Some treats and some dry foods can also help to remove plaque; ask your veterinarian for recommendations of suitable options.
• Have a vet check the mouth during every routine visit in the first year, since Stage 1 and Stage 2 problems (overbite, underbite, retained baby teeth) are far easier to correct early than after the jaw has finished growing.
• Never assume "no visible signs" means "no problem." Cats are exceptionally good at hiding oral pain, so scheduled checks matter more than waiting for obvious symptoms.

Frequently Asked Questions

Is it normal to find my kitten's baby teeth on the floor?
Yes, completely normal. As permanent teeth push up from underneath, the roots of baby teeth dissolve and the tooth falls out usually between 4 and 7 months of age. Many kittens simply swallow the tooth during a meal without any issue at all.

How many teeth do adult cats have compared to kittens?
Kittens have 26 baby (deciduous) teeth, while adult cats have 30 permanent teeth. The extra four are molars, which only appear in the adult set kittens never have molars among their baby teeth.

What if my kitten's baby tooth hasn't fallen out and the adult tooth is already showing?
This is called a retained deciduous tooth, and it needs a vet's attention rather than a wait-and-see approach. Left in place, it can force the incoming permanent tooth into the wrong position, and this doesn't correct itself the way it might seem to.

Do cats get cavities like people do?
Not typically. Instead, cats commonly develop a different condition called tooth resorption, where the tooth structure itself breaks down, often starting at the gumline. It's the most frequently diagnosed dental problem in cats and usually requires extraction of the affected tooth.

When should my kitten have their first dental check?
Ideally, a vet should look at your kitten's mouth during every routine puppy/kitten wellness visit in the first year, since this is exactly when bite problems and retained baby teeth are easiest to catch and correct.

References

1. Merck Veterinary Manual — Dental Development of Cats
2. Merck Veterinary Manual — Dental Disorders of Cats
3. Merck Veterinary Manual — Congenital and Inherited Disorders of the Digestive System in Cats
4. Merck Veterinary Manual — Dental Development in Animals