What Causes Bad Breath in Cats

Nutrition & Diet ๐Ÿ“… August 9, 2026 ๐Ÿ‘ 8881

๐Ÿ“ Summary

Cats are modern must-have companions, yet many have serious bad breath. Common causes include vitamin B deficiency, poor digestion, strong-smelling food, and plaque buildup.

1 What Causes Bad Breath in Cats

To fix bad breath, tackle the cause, one by one.

Vitamin B deficiency

There are many B vitamins; though a kitten needs little, B is essential nutrition.

Advice: add B-vitamin powder to the usual kibble, or give nutritional paste for balanced nutrition.

Poor digestion

Some kittens digest poorly; gut gas rises and exits through the mouth as bad breath.

So feed measured amounts, limited dietโ€”like people, 70โ€“80% full per meal, not stuffed.

Cats with weak guts should eat only easily digested kibble/meat within tolerance; if digestion is poor, give probiotics.

Plaque residue

After eating, food residue on teeth causes bad breath; long uncleaned, it forms tartar.

Also, strong-smelling kibble lingers in the mouth and becomes odor.

For this, give breath-freshening cat treats, dental chews, or push water; a cat toothbrush can remove odor. Canned food easily causes bad breathโ€”clean the mouth regularly.

If possible, brush at home; if heavy tartar, a professional dental cleaning at the vet. For serious odor, brush 1โ€“2 times a week to cut plaque.

Oral infection

Feeding canned food, pouches, or softened kibble easily causes cavities; residue forms plaque and may become periodontitis.

If your cat’s teeth are very dirty, bad breath is likely cavities.

Advice: brush the cat’s teeth; don’t often feed soft foods to reduce residue and plaque.

Drooling

Mouth ulcers aren’t just human; cats get them too. Also, when kittens teethe, old teeth that don’t fall in time cause bad breathโ€”then extraction is needed.

For such causes, watch oral health and see a vet promptly if problems appear.

Want to learn more about pet health?

Explore our pet health channel for more science-based care guides

Read More Articles โ†’