The solution of students’ bad breath can be relieved by brushing, filling, scaling and oral treatment of gastrointestinal drugs, the problem of halitosis needs to be examined systemically and orally to determine the cause of the disease and then take treatment measures respectively. 1. Plaque accumulation and caries: students do not pay attention to oral hygiene and cleanliness will cause plaque accumulation on the surface of the teeth to form milk teeth caries, the accumulation of food and soft dirt will emit a putrid odor. Need to brush the teeth in time to remove the agent to grind away the decayed dental tissues, after the preparation of cavities, the application of dental filling materials for dental repair, can not be retained residual roots, crowns can be extracted to avoid periodontal abscesses. 2. Digestive disorders: students with improper diet, spleen and stomach dysfunction, food digestion and absorption disorders, acid reflux, belching, bad breath, etc., need to be examined under the guidance of the doctor to take medications to promote digestion, such as gastric suppression tablets, omeprazole and so on. 3. tonsil stones: tonsil stones are also common causes of bad breath in students, tonsil folds of food debris, shedding epithelium and bacterial reproduction, easy to produce bad breath, need to be removed by a professional doctor using instruments. When students have bad breath, it is important to draw the attention of parents, timely medical treatment, find out the cause, symptomatic treatment, do not be negligent, or blind treatment on their own, so as not to delay or aggravate the condition.