Mouth ulcers can certainly lick the wound, as it is an involuntary problem in itself. Many mouth ulcers are located on the tongue itself or on top of the lips, which inevitably causes contact between the tongue and the ulcer during speech and chewing. The most obvious symptom of this phenomenon is that it can lead to increased pain, but there are no particularly serious complications, which is inevitable in clinical practice, so mouth ulcers can certainly lick the wound. For the mouth ulcer itself has the characteristics of recurrent and self-limiting, even without special treatment in about 1-2 weeks time mouth ulcers will naturally improve and gradually heal, but it is indeed difficult to cure, and sometimes it will recur.