Oral ulcers can be treated with a combination of topical medications to achieve anti-inflammatory and analgesic effects and promote healing, such as chlorhexidine combined with cidiaride treatment, rehabilitation of new liquid combined with lidocaine and oxygen therapy, etc. The details are as follows. 1. Chlorhexidine combined with cediiodine treatment: the main components of chlorhexidine are metronidazole and chlorogluconate, which have strong bactericidal effect, and cediiodine has bactericidal and antiviral effects, and the combined use of the two can promote the healing of oral ulcers. 2. Rehabilitation new liquid combined with lidocaine and oxygen therapy: Rehabilitation new liquid can improve the local microcirculation of the lesion and promote the new generation of granulation tissue, lidocaine can reduce the pain of the wound, oxygen therapy can reduce the local pain and swelling and improve the metabolism of oxygen, and the combination of all three can relieve the pain and promote the healing of oral ulcers. All of the above drugs need to be used under the guidance of a doctor, it is recommended to go to the hospital to receive regular treatment.