Mouth ulcers are too painful, should be under the guidance of a professional doctor for pain management, you can gargle with medicated solutions, use anti-inflammatory pain oral sprays or oral pain medication. 1. Gargle with medication solution: If the mouth ulcers are too painful, you can dilute lidocaine or procaine and other medications with saline, and use it to gargle directly to relieve the pain in the mouth. 2. Use of anti-inflammatory oral sprays: If the mouth ulcers are too painful, you can use anti-inflammatory oral sprays under the guidance of the doctor, such as watermelon cream spray, open-throat sword spray or lidocaine aerosol, etc., the pain-relieving effect is relatively good. 3. Oral pain medication: If the mouth ulcers are too painful, you can also take oral pain medication, such as Loxoprofen sodium tablets, diclofenac sodium extended-release tablets, etc., which can effectively alleviate oral pain. If the mouth ulcers are too painful, it is recommended to go to the stomatology department of the regular hospital as soon as possible, so that the professional doctor can take the necessary pain-relieving measures to avoid the worsening of the mouth ulcers. Medications should be used under the guidance of a physician.