Tattoo artists estimate that inner lip tattoos last for 12 months on average with the proper care and a touch-up if needed, according to Skin Artists Magazine. Inner lip tattoos may fade faster, depending on factors that include how often the skin cells in the mouth regenerate and the constant presence of saliva.
Tattoos inside the mouth fade faster than traditional tattoos. The turnover rate for cells within the mouth is more frequent than the skin shedding that occurs on the outer body. Proper care is essential to help preserve an inner lip tattoo. Tattoo artists suggest rinsing with antibacterial mouthwash frequently, because the human mouth contains bacteria that can easily lead to infection in a fresh tattoo.