A kitten has 26 deciduous teeth by 6-8 weeks and 30 permanent teeth by 6-7 months, which means five months of a mouth under construction. Loose incisors, a canine on the floor, and a sudden bite reflex are all normal parts of that, and none of them need treatment unless a baby tooth stays put next to its adult replacement.
What matters is knowing the order, redirecting the biting before it becomes a habit, and checking the mouth once a week so a retained tooth or a sore gum line gets caught early.
What is actually happening in the mouth
Baby teeth start erupting at 2-4 weeks, while the kitten is still nursing, and the full set of 26 arrives by 6-8 weeks. From about 11 weeks the roots begin to resorb, and the teeth loosen and fall out. The adult set is 30: the difference of four is the molars, which cats do not have in the deciduous set. Most kittens swallow the shed teeth, so finding one is luck, not evidence.
Shedding is usually painless, but it is not comfortable. The gums are inflamed where a tooth is leaving, and the pressure of a new tooth coming through the same spot makes chewing feel better than not chewing.
The order teeth come out and come in
| Age | What happens |
|---|---|
| 2-4 weeks | Deciduous incisors erupt |
| 3-4 weeks | Deciduous canines |
| 4-6 weeks | Deciduous premolars, 26 teeth total |
| 3-4 months | Incisors shed; adult incisors arrive |
| 4-5 months | Canines shed and are replaced |
| 4-6 months | Premolars and molars erupt |
| 6-7 months | Full adult set of 30 |
Two windows are worth marking. Around 3.5 months the incisors go, which is why a kitten suddenly dribbles or chews the edge of a bowl. Around 4.5 months the canines go, and that is the sharpest week of the whole process.
Why biting gets worse at four months
Two things collide. The mouth hurts, so biting relieves it. And the kitten has just left the window where littermates taught bite inhibition, which normally closes around 12-14 weeks: a sibling yelps and stops playing, and the kitten learns that teeth end the game. A kitten separated at 8 weeks never gets that feedback, and a single kitten has nobody to practice on except you.
So the biting is not aggression and it is not a phase to wait out. It is a gap in learning, and it closes fastest with a consistent response: go still, say nothing, remove your hand, and end the interaction for 30-60 seconds. Then offer an appropriate thing to bite. Tapping the nose or yanking the hand away reads as play and makes it worse.
What is safe to chew
- A damp washcloth, twisted into a rope and frozen for 2 hours. Give it for 10-15 minutes, supervise, and replace it daily because a thawed cloth grows bacteria fast.
- A rubber kitten chew with a textured surface, sized so it cannot be swallowed. Check for punctures weekly and throw it out at the first one.
- Frozen low-sodium broth in a silicone mold, for a kitten that is already on solids.
- A soft cloth toy for carrying, which is the other thing a teething kitten wants to do with its mouth.
Cold and pressure are the two things that help. Keep sessions short: 10-15 minutes, 2-3 times a day, is more useful than leaving a chew out all day, because a bored kitten stops using it and starts on the furniture.
What not to give
Cooked bones splinter. Antlers, hooves and hard nylon chews fracture the upper fourth premolar, the tooth that shears food and the most expensive to remove. Strings, ribbon and hair ties cause linear foreign bodies, which is 2,000-5,000 dollars of surgery and a real risk of gut resection. Rawhide swells and can lodge. Ice cubes are too hard for a 4-month jaw and give little relief.
Your hands are the most important item on this list. Every time a hand is available as a toy, the lesson is reinforced, and the adult cat that bites during petting at 3 years old is usually the kitten that was allowed to mouth hands at 4 months.
Retained baby teeth need to come out
The commonest problem is a persistent deciduous canine: the adult tooth erupts beside the baby tooth instead of pushing it out, and you see two canines on the same side, one slightly behind the other. The same happens with incisors and premolars, just less visibly. The baby tooth should be gone by 6-7 months.
A retained tooth traps food and plaque, pushes the adult tooth out of alignment, and can fuse to the bone. Extraction is usually done at the same anesthetic as the spay or neuter at 5-6 months, which is the practical reason to have the mouth checked at that appointment. Waiting past 7-8 months makes the extraction harder and the orthodontic damage permanent. Extraction is a scale-and-polish plus one or two teeth, not a major procedure.
Check the mouth once a week
Lift the lip on both sides for five seconds and look at the gum line where it meets the tooth. In a teething kitten you expect mild redness. What you do not expect is a bright red band along several teeth, bleeding when you touch it, or bad breath, all of which suggest juvenile gingivitis or stomatitis and need a vet look. Photograph the mouth monthly; a photo beats describing a gum color.
Start brushing at the same time. A finger cot first, then a soft kitten brush, with a pet enzymatic paste that the cat will accept as a treat. Three times a week is the minimum that helps, daily is better, and human toothpaste is not an option because of fluoride and xylitol. A kitten that learns brushing at 4 months is a cat that keeps its teeth at 14. Background on what happens when it is skipped is in dental disease in cats.
When to call the vet
- Two canines on one side after 6 months: book the extraction.
- Swelling on the muzzle or under the eye, which can mean an abscess.
- Drooling that persists, or dropping food while eating.
- Not eating for 24 hours, or eating only soft food for more than 2 days.
- A broken tooth with a visible pink or dark center.
- Bleeding gums that do not settle in a week.
The rest of the first year, from weight curves to when the adult coat arrives, is mapped in kitten milestones from 0 to 12 months. For the biting itself, the difference between play and aggression is worth reading up on in biting and aggression in cats.
Frequently asked
Do kittens lose their baby teeth and swallow them?
Usually yes. The teeth are small, the roots resorb before the crown detaches, and most kittens swallow the tooth while eating or grooming, so finding one on the floor is uncommon. Swallowing is harmless. If you want to track the process, check the mouth weekly for gaps and for adult teeth pushing through rather than hunting for shed teeth.
Is it normal for a kitten to bite more at four months?
Yes, and it has two causes. The gums are sore where teeth are being replaced, so chewing relieves pressure, and the kitten has just passed the age when littermates taught bite inhibition. The fix is consistency rather than punishment: freeze, withdraw attention for a minute, then offer a cold chew, and never let hands become the toy.
When should a retained baby tooth be removed?
Before 7 months, and ideally at the same anesthetic as the spay or neuter at 5-6 months. A deciduous canine that is still present when the adult tooth has fully erupted will not fall out on its own, and it traps food, displaces the adult tooth and can fuse to the jaw. Extraction at that stage is a short addition to an existing procedure.