Cat Teeth: 26 Deciduous, 30 Permanent, No Grinding

A kitten grows 26 deciduous teeth and an adult cat keeps 30 permanent ones, and not a single pair of them is built to grind. Cat teeth shear. That one fact explains most of what goes wrong in a cat's mouth: food slides past the sides of the teeth instead of scouring them, tartar collects along the gum line within days, and a periodontal pocket deeper than 1 mm is already abnormal.

The practical target is simple: 30 teeth at 7 months, a check of every tooth at 12 months, and a pocket probe at every visit after that.

26 first, then 30

The deciduous set is 26: 12 incisors, 4 canines and 10 premolars, with no molars at all. The permanent set adds 4 molars and loses nothing, which is how a cat ends at 30: 12 incisors, 4 canines, 10 premolars and 4 molars. Cats have no upper first premolar and no lower second premolar, so the count is lower than a dog's 42 on purpose, not by disease.

The timetable runs fast. Incisors break through at 2 to 4 weeks, canines at 3 to 4 weeks, premolars at 4 to 6 weeks, and the full set is in by 6 to 8 weeks. Permanent incisors arrive at 3 to 4 months, canines at 4 to 5 months, premolars at 4 to 6 months, molars at 4 to 5 months. By 7 months all 30 should be in place; a retained deciduous canine that is still there at 7 months pushes the permanent tooth out of line and should come out.

No flat surface, no self-cleaning

The working teeth are the carnassials: the upper fourth premolar and the lower first molar, a pair of blades that slide past each other like scissors. A cat's jaw closes in a near-vertical arc with 1 to 2 mm of side-to-side travel, so there is no lateral grinding stroke at all. Kibble shatters against the blades and falls away; it does not wipe the surface.

This is why dry food alone does not clean teeth, a point reviewed in dental diets and the evidence. Only a diet with a specific mechanical texture, or a chew tested for abrasion, changes the plaque load, and even then only on the teeth it touches.

The 1 mm line

A healthy gingival sulcus in a cat is 0.5 to 1 mm deep. Anything that probes deeper than 1 mm is a pocket, and a pocket means attachment has already been lost. Most vets grade it: stage 1 is gingivitis with no loss, stage 2 is under 25 percent attachment loss, stage 3 is 25 to 50 percent, stage 4 is over 50 percent. Probing is a 2 to 3 minute job with a marked probe under light sedation for the back teeth.

Gingivitis itself reverses. Plaque starts forming within 24 hours of a clean, and clinically visible gingivitis appears in 2 to 3 days without any brushing; remove the plaque and the redness is gone in 10 to 14 days. Loss of attachment does not reverse, which is the whole argument for starting early.

Resorption after age 3

Tooth resorption, often called FORL, is the most common dental disease in cats past middle age. It shows up far more often after 3 years and climbs further after 5. The lesion usually starts at the gum line, where the crown looks pink, then yellow-brown, then seems to be cut off at the neck. It hurts in a way cats hide: a cat chewing on one side, dropping food, or flinching at a 1 to 2 second touch on the jaw is showing you a resorbing tooth.

Most of these lesions cannot be seen by eye. Intraoral radiographs are what confirm them, and 6 to 8 small films are typical for a full mouth. Extraction is the treatment; scaling a resorbing tooth makes it worse, because the crown is already weak and the nerve is often exposed.

Brushing that a cat will accept

Two minutes a day is the ideal, 3 times a week is the realistic minimum, and 2 weeks of daily work at 30 seconds per side is how most cats learn to tolerate it. Use a soft finger brush or a 1 cm gauze square, a pet toothpaste with an enzymatic base, and work along the gum line at 45 degrees rather than on the crown. Human toothpaste is not an option: fluoride at 1,000 to 1,500 ppm and xylitol are both toxic to cats.

Checks by age

Age	What is in the mouth	Key event	Check every
2 to 4 weeks	12 incisors erupting	sore mouth, soft food	1 week
3 to 6 weeks	26 deciduous teeth	weaning at 4 to 6 weeks	2 weeks
4 to 6 months	mixed set, 26 plus 30	retained deciduous canines	1 month
7 months	30 permanent teeth	first full count	6 months
1 to 3 years	30, early tartar	first scale and polish	6 to 12 months
3 to 6 years	30, resorption risk	full mouth x-rays	12 months
8 years and up	often fewer than 30	kidney and heart screen	6 months

When a mouth needs the vet today

Drooling with one paw at the mouth, a swelling under the eye, or a cat that has eaten nothing for 24 hours and hides its head are same-day problems. Facial swelling that closes one eye is an abscess until proven otherwise, and a cat with a fractured upper canine usually has a hole into the nasal cavity. Weight matters too: a 5 percent drop in 4 weeks in an older cat with bad breath is a dental case until a full exam says otherwise. Age charts such as a cat age calculator help set the interval: a 12-year-old mouth changes faster than a 3-year-old one, so the check every 6 months is not the same test.

The 4 habits that keep 30 teeth

Brush 3 to 7 times a week, starting at 6 months, for 30 seconds a side. Book a first dental scale with radiographs at 1 to 3 years, not at 8. Feed a diet with a proven mechanical texture for part of the week rather than free-feeding soft food, and keep the water bowl clean. Finally, look in the mouth every 7 days: lift the lip 1 cm on each side and check the 4 canines and the back teeth for a red line at the gum. Details of technique are in how to brush a cat's teeth.

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