Do Dogs Grow More Teeth? | The Two-Set Truth

You find a tiny, sharp tooth on the floor and wonder if it will grow back. That little white spear came from your puppy, and the worry makes sense—if a human loses a baby tooth, a permanent one eventually arrives. But dogs follow a different dental schedule.

The honest answer is that dogs get only one upgrade in their lifetime. They start with zero teeth at birth, grow a full set of 28 baby teeth, then replace every single one of them with 42 permanent adult teeth. After that, no new teeth will appear.

From Zero to 28: The Puppy Tooth Timeline

Puppies are born completely toothless. Their first baby teeth, also called deciduous teeth, begin to push through the gums between 3 and 6 weeks of age. Most pups have their full set of 28 baby teeth by the time they are 6 to 8 weeks old.

These 28 include incisors, canines, and premolars—no molars yet. The incisors (the small front teeth) are usually the first to appear and later the first to fall out when the adult teeth start pushing through.

Why the “Grow More” Question Confuses Owners

Many people assume that a dog’s teeth keep growing like shark teeth or that a lost adult tooth might regenerate. That idea probably comes from watching puppies go through teething, where teeth seem to come and go quickly. It looks like continuous growth, but it’s actually a planned swap.

Here is what actually happens during the teething process:

• Baby teeth fall out on schedule: Around 3 to 4 months of age, the roots of the baby teeth dissolve, and the teeth loosen and drop out. The incisors are the first to go.
• Adult teeth push through immediately: As each baby tooth falls, the permanent tooth underneath moves into place. The whole process is a one-time replacement, not a new growth.
• The count increases by 14: Puppies have 28 baby teeth; adults have 42. The extra 14 are molars—dogs need more grinding surface for their diet.
• Upper and lower jaws differ: An adult dog’s upper jaw holds 20 teeth, while the lower jaw holds 22 teeth. That asymmetry is normal.
• Timing varies by breed and size: Small breeds may take a little longer to finish teething, but most dogs are done by 6 to 7 months.

The bottom line: dogs grow more teeth exactly once, and that transition is a complete replacement, not a continuous addition.

The One-Time Switch to 42 Adult Teeth

Between 4 and 6 months of age, your puppy is likely losing baby teeth left and right. You might find a few on the floor or notice a slight gap that quickly fills. By 6 to 7 months, a full set of 42 adult teeth should be in place—12 incisors, 4 canines, 16 premolars, and 10 molars.

The USDA notes that puppy teeth grow in and are replaced by permanent teeth on a fairly consistent schedule, making it possible to estimate a puppy’s age by examining their teeth. That’s how vets can tell roughly how old a stray pup is—by checking which teeth are present and how worn they are, using the aging puppies by teeth guide.

Once those 42 adult teeth are in, there are no more to come. A dog’s dental formula is fixed for life, unlike a shark’s endless conveyor belt of replacement teeth.

That table makes it clear: dogs grow more teeth only once, and the jump from 28 to 42 happens entirely during puppyhood. After that, the number is fixed.

What Happens If an Adult Tooth Falls Out?

Once a permanent tooth is gone, it’s gone for good. There is no backup set waiting to erupt. If your adult dog loses a tooth due to injury, disease, or decay, that gap will remain. Here is what you should know about adult tooth loss in dogs:

1. Don’t wait to see a vet: A lost adult tooth could indicate underlying dental disease or trauma. A quick exam can rule out infection or jaw injury.
2. Adjust diet temporarily: Soft food or soaked kibble may be easier for a dog with a missing tooth, especially if the gap is near where they chew.
3. Monitor the adjacent teeth: Gaps can shift other teeth over time, leading to misalignment or additional wear. Regular dental checks help catch this early.
4. Consider professional cleaning: If tooth loss was caused by periodontal disease, a professional cleaning under anesthesia might be needed to save other teeth.

Overall, the best approach is prevention—brushing, dental chews, and annual vet dental exams can help keep those 42 teeth healthy for as long as possible.

Keeping Those 42 Teeth Healthy for Life

Because adult teeth cannot regrow, lifelong care matters. The American Kennel Club emphasizes that a dog’s permanent teeth are designed to last a lifetime, but they need maintenance. Brushing two to three times a week with a dog-safe toothpaste can reduce plaque buildup and lower the risk of gum disease.

Feeding a balanced diet also plays a role. Hard kibble provides some mechanical cleaning, and dental-specific treats or toys can help scrape tartar off the chewing surfaces. Annual vet dental checkups are widely recommended, and professional cleanings may be needed if plaque has hardened into calculus. For a complete overview of how a dog’s two sets of teeth work and why permanent teeth matter, the two sets of teeth article from the AKC is a helpful resource.

These simple habits can go a long way toward preserving your dog’s 42 permanent teeth. Without them, tooth loss from decay or infection is permanent.

The Bottom Line

Dogs grow more teeth exactly once: they start with 28 baby teeth and replace them with 42 permanent teeth by about 7 months of age. After that, no new teeth will grow. That makes dental care a permanent commitment—once an adult tooth is lost, it’s gone.

If you’re concerned about your dog’s teeth, from retained baby teeth to chipped adult teeth, your veterinarian can examine their mouth and recommend next steps tailored to your dog’s breed, age, and existing dental health.