The foul smell in the teeth is firstly considered to be caused by the food residue embedding, due to the deterioration and acid production caused by not cleaning the mouth in time. At the same time, poor oral environment can cause bacterial growth to form calculus and plaque, leading to dental caries, gingivitis, bacterial infectious stomatitis and other oral diseases, can also cause periodontal abscesses, cavities, so that there is a foul odor between the teeth, there are usually the following treatment methods: a. Clean the mouth 1. Brush carefully: it is recommended that patients should ensure that they brush their teeth for 3 minutes or more in the morning, before bed and after meals, in order to ensure that every surface of the teeth and between the teeth are fully cleaned, while patients should choose toothbrushes with soft bristles to avoid damaging the teeth and gums. For food residues that cannot be removed by toothbrush or toothpick, they can be cleaned by flossing; 2. Clean the mouth and crevices in a timely manner: after ingesting foods that produce irritating odors such as garlic, leeks, ginger, and raw onions, as well as drinking alcohol, strong tea or coffee, the residue of drinks in the mouth should be reduced by rinsing to avoid causing bad breath. For food residues embedded in the crevices of the teeth, you can use toothpicks or dental floss to remove. Second, the cause of treatment 1, cleaning treatment: for bacteria breeding breeding caused by plaque, calculus and other symptoms, can not be changed by brushing, can go to the hospital for supragingival scaling, that is, scaling or subgingival scaling treatment. A week after the operation may appear gum bleeding, gums, teeth sensitive to cold wind, cold water and other symptoms of stimulation, is a normal phenomenon, patients also need regular follow-up; long-term maintenance of oral hygiene, you can try to avoid this problem; 2, antibacterial treatment: commonly used hydrogen peroxide solution, iodine preparations, chlorhexidine, procaine and other solutions containing rinse, or tetracycline, doxycycline, metronidazole, penicillin, Azithromycin and other oral medication. Appropriate supplementation of vitamin C or B vitamins can also be effective antibacterial; 3, other treatment: the cavity of teeth caused by caries and other factors often causes food embedment and deterioration causing oral or tooth odor, so the cavity of caries can be treated by silver amalgam filling, inlay restoration and sulcus closure to prevent food embedment. Teenagers who have food embedding due to misalignment of teeth can choose orthodontic treatment as appropriate.