OTC mouthwashes intended for mouth sores typically contain lidocaine, an ingredient that can help relieve canker sore pain. A doctor may also prescribe a prescription mouthwash containing dexamethasone or lidocaine. 用于口腔溃疡的OTC漱口水通常含有利多卡因,这是一种可以帮助缓解口腔溃疡疼痛的成分。医生...