Mouth ulcers take what medicine no longer recur is not an accurate judgment, clinically there is no drug can effectively inhibit the recurrence of mouth ulcers. Mouth ulcers are mainly divided into traumatic mouth ulcers, recurrent aphthous ulcers, cancerous mouth ulcers, etc. The recurrence rate of mouth ulcers is relatively high, and it is generally not possible to control the recurrence of mouth ulcers. Clinically, after the appearance of mouth ulcers need to understand the cause of mouth ulcers and then symptomatic treatment, the more common is recurrent aphthous ulcers. After the appearance of the doctor can be used under the guidance of the cedi iodine tablets, chlorhexidine solution and other drugs treatment. Usually need to pay attention to personal oral hygiene, eat more food containing more vitamins, but also need to appropriate activities, enhance resistance, to avoid mouth ulcers recurring.