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Halitosis is an offensive odor coming from the mouth. Halitosis can be caused by:
The most common cause of halitosis in cats is periodontal disease caused from plaque and tartar build-up. Plaque-containing bacteria attaches over the freshly cleaned and polished tooth as soon as the cat starts to salivate. Within days, the plaque becomes mineralized, producing rough tartar (calculus) which accumulates more plaque and causes gum inflammation (gingivitis).
As plaque ages and gingivitis progresses into periodontitis (tooth support loss), the bacterial flora changes from good bacteria to destructive bacteria.
The primary cause of bad breath in cats is bad bacteria causing decay that creates smelly sulfur compounds. Volatile sulfur compounds may also play a role in periodontal disease, affecting the integrity of the tissue barrier, allowing endotoxins (a part of bacteria) to produce periodontal destruction, endotoxemia (endotoxins in the blood), and bacteremia (bacteria in the blood).
Treatment of halitosis in cats involves eliminating the cause(s). First, a thorough examination of the entire oral cavity is necessary. Then the teeth must be thoroughly cleaned and polished under general anesthesia (see handout "Dental Cleaning in Cats" for more information). Cleaning removes plaque and tartar (calculus) above and below the gumline (with the help of hand instruments and scaler tips designed to be used under the gumline).
After teeth cleaning, a tooth-by-tooth examination is conducted. Intraoral dental X-rays are inspected to assess structures beneath the gumline. Often, those teeth affected by advanced periodontal disease or tooth resorption need to be extracted.
After the causes of halitosis have been identified and eliminated, daily plaque control is an essential part of controlling halitosis and preventing it from recurring.
Fortunately, there are products available that decrease the accumulation of plaque once the teeth are clean. The Veterinary Oral Health Council only accepts dental products that are safe and proven to reduce the accumulation of plaque and tartar based on scientific studies. These products include dental diets, treats, water additives, and topical applications. Accepted products are listed at VOHC.org, or ask your veterinarian for recommendations.
Oral care products containing zinc can inhibit the formation of odor through their natural attraction to sulfur; zinc and hydrogen sulfide combine to form the insoluble compound zinc sulfide. Zinc also interferes with microbial growth and calcification of microbial deposits that can cause halitosis.
Dental examinations at least twice a year are recommended to help treat and prevent halitosis.
© Copyright 2025 LifeLearn Inc. Used and/or modified with permission under license. This content written by LifeLearn Animal Health (LifeLearn Inc.) is licensed to this practice for the personal use of our clients. Any copying, printing or further distribution is prohibited without the express written consent of LifeLearn. This content does not contain all available information for any referenced medications and has not been reviewed by the FDA Center for Veterinary Medicine, or Health Canada Veterinary Drugs Directorate. This content may help answer commonly asked questions, but is not a substitute for medical advice, or a proper consultation and/or clinical examination of your pet by a veterinarian. Please contact your veterinarian if you have any questions or concerns about your pet’s health. Last updated on Nov 23, 2023.
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