If there are ulcers inside the lower lip, if there are local irritants, these irritants should be removed, and if there are sharp tooth tips, or abnormalities in the occlusal overmandibular coverage, or residual roots or crowns, they should be repaired or extracted in a timely manner. In addition, if there are bad restorations, they should also be modified or replaced in a timely manner. As for the ulcer surface inside the lower lip, you can use coated ulcer ointment, such as tretinoin ointment, or you can choose to use mouthwash, such as 0.02% furacilin liquid or choose 0.12% compound chlorhexidine rinse. You can also apply beads of pearly whites, cytisine, or choose watermelon cream spray on the surface, which can promote the healing of ulcers quickly. And if the pain is heavy, you can use pain-relieving drugs, such as 0.5% Dacronin Hydrochloride solution applied to the surface, which can provide pain-relieving effect. If the ulcer inside the lower lip is heavy, you can also choose to do physical therapy or laser, which can heal quickly.