Will cavities cause bad breath?

Will cavities cause bad breath?

Healthline says indirectly. A cavity itself does not smell, but the bacteria in the plaque that causes the cavity can produce odor, often described as sulfur-like. It adds that a cavity may leave a sour or bitter taste that brushing does not remove, and that breath may improve after the cavity is treated. The NHS tooth decay page lists toothache, sensitivity and white, brown or black spots among the symptoms but does not mention bad breath or taste.

What happens when you get a cavity

Cleveland Clinic describes five stages: demineralization, enamel decay, dentin decay, pulp damage and abscess. Early stages often have no symptoms, and bad breath is not one of the typical early signs it lists. Later stages bring sensitivity, pain, gum redness and swelling, and, if untreated, an abscess. Healthline notes that cavities often cause no symptoms in their early stages, and lists tooth pain, white or dark spots, sensitivity to hot or cold, an abscess near the tooth, and fever or facial swelling, which can signal an infected abscess.

Can an infected tooth cause bad breath?

Yes. Cleveland Clinic lists bad breath or a bitter taste among the symptoms of a tooth abscess, alongside severe tooth pain that may radiate to the ear, jaw or neck, gum redness and swelling, a loose tooth, swelling of the jaw, swollen lymph nodes, an open draining sore on the gum and fever. The NHS lists a bad taste and a swollen face or jaw. An abscess will not go away on its own and needs urgent dental treatment, as our tooth infection guide explains.

Other causes of persistent bad breath

Healthline says bad breath that continues after treating a cavity or improving hygiene may have other causes.

• Dry mouth and certain foods.
• Gum disease and infections.
• Dentures or braces that trap food and plaque.
• Smoking and alcohol.
• Diabetes, acid reflux, sinus problems, and kidney or liver disease.

What to do about bad breath

Healthline's advice is to brush twice daily with fluoride toothpaste for about two minutes and floss daily, rinse with fluoride mouthwash, limit sugary foods and drinks, drink water throughout the day, chew sugar-free gum to prevent dry mouth, and avoid tobacco. Early cavities may be treated with fluoride, and more severe ones need fillings, after which breath may improve. A dentist should confirm that a cavity is the cause before you assume it is.

How a dentist finds the cause

A dentist will examine your teeth and gums and usually take X-rays. Cleveland Clinic says a decayed area may feel softer when probed and X-rays can reveal decay before it is visible. If your gums are the cause, a cleaning or deep cleaning may be needed, and if you have a dry mouth or another medical cause, you may be referred to a doctor.

Can tooth decay cause a bad taste?

Yes. Healthline says a cavity may leave a sour or bitter taste that brushing does not remove, and Cleveland Clinic and the NHS list a bitter or bad taste among abscess symptoms. A persistent bad taste with swelling, pain or fever needs urgent care.

Questions to ask your dentist

If you are worried your breath is caused by a cavity, ask these at your appointment.

• Do I have a cavity, gum disease or something else causing the odor?
• Do I need a filling, a cleaning or a deeper cleaning?
• Could dry mouth, my medicines or my diet be contributing?
• Which mouthwash, if any, should I use?
• Should I see a doctor about anything else?

Frequently asked questions