Teeth stink like a gutter may be caused by dietary factors, dental calculus, dental caries and other reasons. 1. Dietary factors: consumption of onions, garlic, leeks and other odorous foods after the failure to rinse teeth in a timely manner, the odor adherence to the teeth, will lead to teeth stink like a gutter. 2. Dental calculus: oral bacteria and saliva in the mixture of mucus proteins to generate plaque, plaque left in the tooth gap for a long time to form dental calculus. The calculus is lumpy with foul-smelling objects, so the teeth stink like a stinky gutter. 3. Dental caries: Dental caries leads to broken teeth, holes and other problems, food debris is very easy to hide, long time will breed bacteria fermentation. Both will emit a foul odor, so the teeth stink like a gutter. When the teeth stink like a gutter, you should go to the hospital or regular dental clinic in time to clean the teeth, pay attention to the daily protection of the teeth, brush your teeth and rinse your mouth diligently.