Understanding the Causes of Bad Breath in Cats

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Last updated 8/2/2025

cats
bad breath
dental disease
gingivitis
feline health

What Causes Bad Breath in Cats?

Bad breath in cats is often a sign that something may not be right with their health. Here are some common reasons why your cat might have bad breath:
  • Abscessed or decayed tooth
  • Gingivitis, which is inflammation of the gums
  • Periodontal disease
  • Periodontitis, affecting the tissues around the teeth
  • Resorptive dental disease
  • Foreign objects stuck between the teeth
  • Kidney disease
  • Feline leukemia virus
  • Feline stomatitis
  • Mouth tumors

Signs to Watch For

If your cat has bad breath, check for other symptoms, such as:
  • Pain around the mouth area
  • Reluctance to eat or dropping food
  • Pawing at the mouth
  • Drooling
  • Weight loss
These could indicate issues like a bad, broken, or abscessed tooth, or gum disease. Inspect your cat’s mouth for any foreign objects or signs of swelling and bleeding. If unsure, consult your vet.

Dental Issues and Diet

Dental disease is common in cats. It's essential to prevent plaque buildup by cleaning your cat's teeth or having them scaled by a vet annually. Use specially designed toothbrushes and toothpaste for cats. Special diets can also help reduce plaque and tartar. Consider options like Hills Prescription Diet Feline T/D.

Resorptive Dental Disease

Resorptive dental lesions can cause severe pain and bad breath. They usually require the affected teeth to be extracted by a vet.

Gingivitis and Its Progression

Gingivitis is an early stage of gum disease. Symptoms include red, swollen gums that bleed easily. If untreated, it can lead to irreversible periodontitis.

Other Health Concerns

Kidney and Liver Disease Both conditions can contribute to dental issues and bad breath. Dental disease can cause bacteria to enter the bloodstream, affecting the kidneys, liver, and heart. Feline Leukemia Feline leukemia has been linked to bad breath. Your vet can test your cat for this condition.

Feline Stomatitis and Oral Tumors

Stomatitis This is an inflammation of the entire mouth, leading to bad breath, weight loss, and loss of appetite. Mouth Tumors Check for any swelling in the mouth, as this could indicate tumors, which require veterinary evaluation.