If a mouth is broken inside the mouth, it may be related to trauma, or oral mucosal disease, such as oral ulcers, etc. In rare cases, there may also be cancerous conditions. Patients can not accurately determine, to timely go to the hospital by the doctor to make a diagnosis, and under the guidance of the doctor to deal with. 1, trauma: bitten by the teeth to the buccal mucosa of the mouth, or teeth crooked scratch the oral mucosa, traumatic mouth, the diet needs to be light, if the wound is small, you can let it slowly heal, pay attention to oral hygiene, you can apply local rehabilitation new liquid, symptomatic treatment, to promote wound healing. If the wound is large, it may also need to be treated with debridement and suturing, and oral antibiotics such as metronidazole and amoxicillin for treatment. In addition, crooked teeth should undergo corresponding orthodontic treatment, and if they are caused by obstructed wisdom teeth, they can be extracted; 2. Oral mucosal diseases: such as oral ulcers, which can be treated with local application of anti-inflammatory and anti-infective drugs, such as watermelon cream, etc. Candida infection can be treated with antifungal drugs such as miconazole; 3. Cancer: if there is a mouth inside the mucosa, gums, and tongue, and the mouth does not heal for a long time. After the diagnosis is clear, it should be treated according to the principle of malignant tumor, which requires surgical excision and lymphatic dissection, and auxiliary radiotherapy and chemotherapy. A mouth is broken in the mouth, daily life should pay attention, do not eat more stimulating things, such as too hot, too hard, too spicy, too numb food, so as not to cause irritation to the damaged parts, you can eat more vegetables and fruits to supplement vitamins, which will be beneficial to the recovery of the lesion.