Persistent Deciduous Teeth
Many puppies lose their baby teeth naturally as their adult teeth erupt.
Sometimes, however, a baby tooth remains in place even after the adult tooth has started to emerge.
This is called a persistent deciduous tooth.
While it may seem like a minor issue, retained baby teeth can contribute to crowding, abnormal tooth positioning, gum disease, and painful bite abnormalities if left untreated.
Does This Sound Familiar?
You may have noticed:
- Two canine teeth sitting side by side
- A "double fang" appearance
- Adult teeth coming in crooked
- Crowded teeth
- Food getting trapped between teeth
- Bad breath in a young puppy
- Lower canine teeth growing into the roof of the mouth
What Are Retained Deciduous Teeth?
Puppies have baby teeth just like children.
As the adult teeth develop beneath the gums, the roots of the baby teeth normally dissolve, allowing the baby teeth to loosen and fall out.
When this process doesn't occur properly, both teeth remain in the mouth at the same time.
The adult tooth is then forced to erupt around the retained baby tooth rather than into its normal position.
Why Does It Matter?
More Than Just an Extra Tooth
Retained baby teeth can lead to:
Overcrowding:
Too many teeth occupying the same space.
Abnormal Tooth Positioning:
Adult teeth erupt in incorrect locations.
Gum Disease:
Food and bacteria become trapped between closely positioned teeth.
Painful Bite Abnormalities:
Teeth may begin contacting the palate, gums, or other teeth.
Future Orthodontic Problems:
Minor issues during puppyhood can become permanent abnormalities in adulthood.
The Most Common Areas We See
Canine Teeth
The classic "double fang."
This is the most common retained baby tooth we encounter.
Incisors
Crowding at the front of the mouth.
Premolars
Often harder for families to identify but still often capable of causing problems by leading to early dental disease and tooth loss, especially in pug and bulldog breeds.
When Should Baby Teeth Fall Out?
Typical Eruption Timeline
4–5 Months: Incisors begin changing.
5–6 Months: Canines and premolars begin changing.
6–7 Months: Most puppies should have lost their baby teeth.
Important Note
If an adult tooth is visible and the baby tooth is still present, this is an abnormal situation.
Assessment is recommended.
Treatment
Creating Space for Healthy Development
Treatment is usually straightforward and performed under combination therapy or local and general anaesthesia.
The retained baby tooth is carefully extracted while preserving the surrounding adult tooth and developing structures.
The goal is to allow the adult tooth to continue moving into its correct position.
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Sometimes Additional Treatment Is Needed
If a retained baby tooth has already contributed to a developing malocclusion, additional treatment options may include:
- Crown extensions
- Incline planes
- Gingivoplasty
- Strategic extraction
- Other orthodontic interventions, like braces!
Every puppy is assessed individually.
Why Timing Matters
The Earlier We See It, The More Options We Often Have
Puppies are still growing.
Once adult teeth have fully erupted and jaw development is complete, our options for correcting abnormal tooth positions become more limited.
Early intervention often allows us to guide development before permanent damage occurs.
Frequently Asked Questions
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Will the baby tooth eventually fall out?
Sometimes, but if the adult tooth has already erupted alongside it, we risk the tooth not falling out, fracturing, or causing permanent malposition of the adult tooth.
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Is extraction painful?
The procedure is performed under a combination of local and general anaesthesia. This means that when your pet awakens, their extraction site is completely numb. On top of this, all pets are also sent home with appropriate pain management.
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What happens if we leave it alone?
Retained baby teeth can contribute to crowding, gum disease, and bite abnormalities that may require more extensive treatment later.
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Is this an emergency?
Usually no. However, prompt assessment is recommended while the mouth is still developing to improve your options and limit permanent complications.
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My puppy has two fangs. Is that normal?
No. A "double fang" appearance almost always indicates a retained baby canine tooth and should be assessed for treatment before permanent anomalies set in.

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