Short answer
Mouth rot, or infectious stomatitis, is a bacterial or fungal infection of the gums and jaw. Watch for red or bleeding gums, swelling, extra mucus, a yellowish or cheesy material in the mouth, loose teeth and a dragon that stops eating. It is one of the more common problems vets see in bearded dragons. It needs a vet, usually for cleaning and prescription medicine. A varied diet with hard-bodied insects and fibrous greens helps prevent it.
What mouth rot is
Mouth rot, also called infectious stomatitis or periodontal disease, is an infection of the gums and surrounding bone caused by bacteria or fungi.1
Bearded dragons are especially prone to it because of how their teeth are built. They have acrodont teeth, fused to the jaw with a very thin gum line, which is easily damaged and then infected.1 PetMD calls it one of the more common diseases vets see in bearded dragons, and says diet may play a part.1
Signs to watch for
- Red, inflamed or bleeding gums12
- Swelling of the jaw or mouth12
- Extra mucus from the mouth1
- Yellowish or whitish material in or around the mouth2
- Loose teeth, plaque, or an abnormal lip line12
- Not eating, or not being able to close the mouth1
VCA lists cloudy mucus, cottage-cheese-like material and red or bruised gums among the mouth problems to look for when choosing a healthy dragon.3
Normal yellow: some bearded dragons have yellow pigment inside the mouth. PetMD says this is normal.1
Causes
- Poor husbandry, which weakens the immune system so it cannot clear infection1
- A wound in the mouth, which opens a route for infection into bone and teeth12
- Diet, which may predispose dragons to it12
- Incorrect temperatures or high humidity, listed by ReptiFiles2
How vets diagnose and treat it
A vet experienced with reptiles examines the mouth and may take X-rays to see whether the jawbone is affected. Cytology, culture or a biopsy can identify the bacteria or fungi involved.1
Treatment can include:1
- Cleaning the teeth and gums, sometimes daily at home with an antiseptic flush the vet prescribes
- Antibiotics for severe infections involving bone
- Anti-inflammatory and pain medication
- Antifungal drugs in rare cases
- Assisted or tube feeding if the dragon will not eat
Untreated mouth rot can lead to jaw fractures and infection spreading through the body.1
Prevention
- Feed a varied diet that includes hard-bodied insects such as roaches and locusts, and fibrous plants such as leafy greens, pumpkin and sweet potato. PetMD says these help keep the gums healthy and the mouth clean.1
- Get the setup right. ReptiFiles lists a wrong temperature gradient and high humidity among the causes.2 PetMD says poor care weakens the immune system, and good care often prevents mouth rot.1
- Look in the mouth regularly so you notice changes early.1
- Ask your vet about tooth care. PetMD mentions brushing with cotton-tipped applicators, following your vet’s instructions.1
Common questions
Is mouth rot an emergency?
PetMD says it is usually not a medical emergency, but a dragon with any of the signs should see a vet at the earliest opportunity. Untreated mouth rot can lead to jaw fractures and infections that spread through the body.
Is the yellow inside my bearded dragon's mouth normal?
Often, yes. PetMD notes that some bearded dragons have yellow-pigmented areas inside the mouth, and that this is normal. Yellow or white cheesy material on the gums is different and needs a vet.
Can I treat mouth rot at home?
No. ReptiFiles calls it a bacterial infection that needs prescription treatment, and PetMD describes X-rays, cultures and prescription drugs as part of care. Your vet may show you how to clean the mouth at home as part of treatment.
Sources
Numbers in the text link to these sources. We checked each one on the date shown.
- 1Mouth Rot in Bearded DragonsSean Perry, DVM. PetMD. Checked Oct 29, 2026.
- 2Bearded Dragon Mouth Rot / Oral InfectionReptiFiles. Checked Oct 29, 2026.
- 3Bearded Dragons: OwningGregory Rich, DVM; Laurie Hess, DVM; Rick Axelson, DVM. VCA Animal Hospitals. Checked Oct 29, 2026.
Update history
- : First published.
- : Re-checked every claim against its sources; corrected wording, numbers and attributions.
HerpWise Editorial · About the author and review process
HerpWise Editorial summarizes published veterinary, welfare and specialist care guidance. The sources and check date are listed on each guide. Veterinary review is credited separately when completed.
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