There is no drug that can make recurrent mouth ulcers not recur, recurrent mouth ulcers can be appropriate application of topical drugs, as well as oral medications. 1. Topical drugs: severe pain can be appropriate application of lidocaine gel or spray for pain relief; available chlorhexidine and other gargles anti-inflammatory treatment; cidadeine and other broad-spectrum bactericidal astringent effect. 2. Oral medicine: recurring ulcers may be caused by a variety of reasons, vitamin deficiency can be appropriate application of vitamin B1, vitamin B2 and other vitamins; immune deficiency can be appropriate application of levamisole and other immunosuppressants; and hormone levels can be appropriate application of estrogen and so on. Recurrent mouth ulcers should be timely to identify the cause of the disease, drugs should be used in accordance with medical advice.