Retained Baby Teeth in Puppies and Kittens Explained

Most owners of a young dog or cat find a tiny tooth on the carpet at some point and think nothing more about it. Teething is expected, the teeth come out, the adult set arrives, and the whole process passes with no more consequence than a few chewed shoes.

Occasionally it does not go that way. Sometimes an adult tooth erupts while the baby tooth that should have made way for it is still firmly in place. The result is two teeth occupying a space designed for one — a condition properly called persistent deciduous teeth, and known to almost everyone else as retained baby teeth.

It looks minor. Owners frequently notice it, decide it is a cosmetic quirk, and plan to mention it at the next appointment. But this is one of the situations where a small structural problem at six months creates real dental disease by three years, and where acting early is dramatically easier than acting late. This guide explains what happens during normal teething, how to recognize a retained tooth, why it matters, and what the treatment involves.

Important: This article shares general educational information for pet owners and is not a substitute for an in-person veterinary examination, diagnosis, or treatment. For any medical concern or emergency, contact your veterinarian promptly.

Normal Teething in Puppies and Kittens

Puppies and kittens are born without visible teeth. A set of deciduous — baby — teeth erupts during the first weeks of life, and these are gradually replaced by permanent teeth over the following months. Dogs end up with considerably more adult teeth than cats, which is one reason crowding problems are more common in dogs.

The replacement process is elegant. As a permanent tooth develops in the jaw beneath its deciduous predecessor, pressure from the erupting adult tooth stimulates the body to dissolve the root of the baby tooth. With its root gone, the baby tooth becomes loose and falls out, usually swallowed with food or lost somewhere in the house, and the adult tooth rises into the vacated space.

In broad terms, most puppies and kittens have finished this transition and have a full adult set by around six to seven months of age, although there is normal variation between individuals and breeds. Your veterinarian will give you the expected timeline for your specific pet, and the vaccination and neutering appointments in the first year are natural opportunities to check progress.

• Expect mild signs: chewing more, mild gum soreness, small spots of blood on toys.
• Expect found teeth: small hollow shells or slivers, often the incisors first.
• Expect appetite dips: brief and mild, usually lasting a day or two.
• Do not expect: severe pain, refusal to eat for more than a day, facial swelling, or foul odor — these need veterinary attention.

What Goes Wrong in a Retained Tooth

In a retained deciduous tooth, the root fails to dissolve properly. The baby tooth stays anchored, and the erupting permanent tooth is forced to find another route into the mouth. It comes up beside its predecessor rather than through the space it should have occupied.

The result is two teeth side by side where the jaw was designed to hold one. Most often this affects the canine teeth — the long pointed teeth at the corners of the mouth. Upper and lower canines behave differently: an adult upper canine erupts in front of the baby canine it is replacing, while an adult lower canine erupts behind and to the inside (tongue side) of its predecessor. Either way the result is a visible double fang. Incisors and premolars can be affected too.

Why some individuals do this is not entirely settled. There is a strong association with small and toy breed dogs, where a relatively crowded jaw is thought to contribute, and a familial tendency is recognized in several breeds. It occurs in cats as well, though less frequently than in dogs.

The important point for owners is that a retained deciduous tooth does not resolve itself once the adult tooth is fully erupted. If the root has not dissolved by the time the permanent tooth is in place, waiting longer very rarely helps.

How to Spot It at Home

This is a condition owners can genuinely catch themselves, and a two-minute look once two weeks through the teething months is enough.

• Two teeth in one spot: the clearest sign — look both in front of and behind each canine, since the adult tooth comes up in front on top and inside on the bottom.
• A crowded look: teeth that appear to overlap or sit at odd angles.
• Food packing: visible debris trapped between the doubled teeth.
• Early tartar: yellow-brown build-up in a young animal, concentrated around the crowded area.
• Red gum margin: inflammation of the gum immediately around the affected teeth.
• Bad breath: unusual in a young pet and worth investigating.
• A tooth that never fell out: you found none of the expected baby teeth at that site.
• Difficulty closing the mouth normally: a less common but significant finding.

To look properly, choose a calm moment, gently lift the lip on one side rather than trying to open the mouth, and look along the gum line. Praise and a treat afterward every time will make future checks — and eventual toothbrushing — far easier. Never force the examination on a puppy or kitten who is resisting; a short, positive look is worth more than a long, stressful one.

Take a photograph if you see something. Phone photographs of a young animal's mouth are often clearer than what you can see live, and they give your veterinary team something concrete to assess.

Why It Matters More Than It Looks

The reason veterinarians take this seriously has little to do with appearance and everything to do with what happens in the space between the two teeth.

Two teeth crowded together create a narrow gap that food and bacteria enter easily and that neither the tongue nor a toothbrush can clean effectively. That gap becomes a permanently contaminated pocket. Plaque accumulates, mineralizes into tartar, and inflammation of the surrounding gum follows — often within months rather than years. Periodontal disease that would normally take years to develop can appear in a dog barely out of adolescence.

There is a second problem. A permanent tooth forced to erupt in the wrong position may not sit correctly against the opposing jaw. A misdirected lower canine can strike the roof of the mouth rather than slotting into its proper gap, which is painful and can damage the palate. Bite abnormalities established during growth are far harder to address than a retained tooth removed at the right moment.

Third, the permanent tooth in a crowded position is at greater long-term risk. Bone support around a crowded tooth is thinner, and the tooth is more likely to be lost prematurely to periodontal disease years later.

None of this is dramatic in the first weeks, which is exactly why it is easy to postpone. The damage is cumulative and quiet.

What Your Veterinarian Will Assess

An oral examination in a conscious puppy or kitten gives a good deal of information, and it is a standard part of a well-conducted vaccination or pre-neutering appointment.

Your veterinarian will look at which teeth are involved, whether the permanent tooth is in a normal position, how the upper and lower teeth meet, whether the gums are already inflamed, and whether there is any sign that the retained tooth is loosening on its own. Age matters here: a baby tooth that is still mobile in a young puppy may yet come out, whereas a firmly rooted one alongside a fully erupted adult tooth will not.

Dental radiographs are frequently recommended before any treatment, taken under anesthesia. They show the root of the retained tooth, the position and development of the permanent tooth, and whether other teeth are missing or abnormal below the gum line. A tooth that looks straightforward from above can have a long, curved, fragile root that changes the surgical approach entirely.

Treatment: Extraction and Its Timing

The established treatment for a persistent deciduous tooth is extraction of the baby tooth, performed under general anesthesia by your veterinarian. The principle is straightforward: remove the obstruction so the permanent tooth has the best chance of settling into a normal position and so the crowded pocket disappears.

Timing is the whole game. Extraction done early — while the permanent tooth is still erupting and has room to move — gives the best chance of the adult tooth drifting into a better position. The same extraction done a year later removes the crowding and the food trap, which is worthwhile, but the permanent tooth's position is by then largely fixed.

This is why many veterinarians raise the subject at the pre-neutering consultation. If a retained tooth is present and neutering is planned, combining the procedures means one anesthetic rather than two. If neutering is not planned or is scheduled much later, your veterinarian may recommend dealing with the tooth on its own timeline rather than waiting.

Extraction of deciduous teeth is more delicate than it appears. The roots are long and thin relative to the crown and break easily, and a retained fragment left behind can cause ongoing problems. This is careful surgical work, usually done with dental radiographs before and after to confirm complete removal.

Cost and anesthesia are reasonable things to ask about, and your veterinary team will discuss both openly. Modern veterinary anesthesia for a healthy young animal involves pre-anesthetic assessment, individualized protocols, and monitoring throughout, and your veterinarian will explain how risk is managed in your pet's case.

Recovery and Aftercare

Most young animals recover from deciduous extractions quickly, and owners are frequently surprised how normal their pet seems by the following day. Your veterinarian will give specific instructions, and following them precisely matters more than the procedure being small.

1. Give all prescribed pain relief for the full course, even if your pet seems comfortable — young animals mask discomfort well.
2. Offer softened or wet food for the period your veterinarian specifies, usually several days.
3. Withhold hard chews, bones, tug toys, and anything that puts pressure on the healing sites until cleared.
4. Check the extraction sites daily for swelling, bleeding, or discharge, without poking at them.
5. Do not brush the teeth at the surgical sites until your veterinarian says the gums have healed.
6. Keep play calm for the first few days, particularly anything involving mouthing or carrying.
7. Attend the post-operative check even if everything looks fine.
8. Ask when to begin or resume a home toothbrushing routine — usually soon after healing.

Contact your veterinary practice if you see ongoing bleeding, facial swelling, reluctance to eat beyond the expected day or two, foul odor from the mouth, or persistent pawing at the face.

Setting Up Long-Term Dental Health

Correcting a retained tooth removes a specific problem. It does not, on its own, protect the mouth for life. The habits built in the first year do that.

Daily toothbrushing with a toothpaste formulated for dogs and cats remains the most effective home measure for reducing plaque accumulation, and a young animal who has been handled gently around the mouth from the start usually accepts it readily. Human toothpaste should never be used, as it contains ingredients unsuitable for pets.

Where brushing is genuinely not achievable, discuss the options with your veterinarian. Several approaches exist for supporting a home oral hygiene routine, and which one suits your pet depends on temperament, mouth conformation, and what you can realistically keep up with every day. Whatever is chosen, it supports a routine rather than replacing toothbrushing, professional dental assessment, or veterinary care — and after recent oral surgery, nothing new should be introduced without checking with your veterinarian first.

Book the annual dental check and take it seriously. Small breed dogs and cats develop periodontal disease early and quietly, and a mouth examined once a year is a mouth where problems are found while they are still small.

If you are considering breeding from an affected animal, discuss the familial tendency with your veterinarian. This is a recognized heritable trait in several breeds, and it is a legitimate factor in breeding decisions.

Myths and Facts

Myths, Corrected

• Myth: it will fall out eventually. Once the permanent tooth is fully erupted alongside it, a firmly rooted baby tooth almost never resolves.
• Myth: pulling it at home is straightforward. The roots are long and fragile; attempting this causes pain, fractured roots, and infection.
• Myth: hard chews will knock it out. They will not, and they risk fracturing the permanent tooth instead.
• Myth: it is only cosmetic. The crowding creates a food trap that drives early periodontal disease.
• Myth: young animals do not get dental disease. Crowded teeth can produce significant disease well before two years of age.
• Fact: earlier extraction gives the permanent tooth more chance to move. Timing genuinely affects the outcome.
• Fact: dental radiographs matter. They reveal roots and unerupted teeth that cannot be seen from above.
• Fact: small breeds are most affected. Toy and small breed dogs are substantially over-represented.

When to Contact Your Veterinarian

Thresholds for Calling

This is a condition where a routine appointment at the right time prevents an expensive problem later.

• Book an appointment if: you can see two teeth in one position, or a baby tooth still present after the expected age.
• Book sooner if: the gums look red, breath is unpleasant, or food is visibly packing between teeth.
• Seek prompt care for: facial swelling, bleeding from the mouth, refusal to eat, or obvious mouth pain.
• Raise it before neutering if: any dental abnormality is present, so procedures can be planned together.

For any medical emergency, including significant oral bleeding, facial swelling, or a pet unable to eat or drink, contact your veterinarian or your nearest emergency veterinary hospital immediately.

The Practical Takeaway

What to Remember

Retained baby teeth are easy to see, easy to overlook, and disproportionately consequential. A double canine in a five-month-old puppy is not a quirk of the smile; it is a food trap being built into a mouth that has to last fifteen years.

The practical advice is simple. Look at your puppy's or kitten's teeth every couple of weeks through the teething period. Photograph anything that looks doubled or crowded. Raise it at the next appointment rather than the one after that, and ask specifically whether treatment is better done now or later in your pet's case.

And once it is dealt with, use the moment. A young animal who has just been through a dental procedure is an ideal candidate for starting a lifelong toothbrushing habit, because you have their owner's full attention and a clean mouth to start from. The retained tooth is a small problem solved; the daily routine that follows it is the part that pays off for the next decade.