The inside of the lips cracked generally can not use band-aid treatment, the reasons include band-aid can not be close to the mucosa, and the oral cavity is not a sterile environment, etc., as follows. 1. Band-Aid can’t fit closely with the mucous membrane: there is saliva in the mouth all the time, and the mucous membrane surface is smooth, the Band-Aid can’t be pasted and fixed, and the sense of foreign body in the mouth is obvious, and it may be swallowed accidentally. 2. Non-sterile environment in the oral cavity: the presence of various flora in the oral cavity, wounds are susceptible to infection, infected wounds should not use band-aid, and band-aid easy to breed bacteria, may aggravate the infection. The use of band-aids should be under the guidance of a doctor, it is recommended to go to the hospital to receive regular treatment.