The definition of bad breath, or halitosis, is an unpleasant odor of the mouth. It can occur on occasion, or it can be a chronic condition. It may be caused by foods a person eats, poor oral hygiene, medical conditions, or other factors.

 What are the causes and risk factors of bad brea

Food is a primary source of bad odors that come from the mouth. Some foods, such as garlic, onions, and spicy foods, exotic spices (such as curry), some cheeses, fish, and acidic beveragessuch as coffee can leave a lingering smell. Most of the time this is short term. Other foods may get stuck in the teeth, promoting the growth of bacteria, which causes bad breath odor. Low carbohydrate diets may also cause “ketone breath.” These diets cause the body to burnfat as its energy source. The end-product of making this energy is ketones, which cause a fruity acetone-like odor on the breath when exhaled.

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