Something I really don't understand

Lips are supposed to be under a lot of stress and nearly constant movement and touching...I mean there are people who talk all day long and move their lips constantly creating all kinds of trauma...I just truly am baffled at how someone can get this condition honestly. From the constant talking, kissing, other sexua| things, eating, drinking, smiling, etc, the lips are able to tolerate a ton of trauma. It honestly makes no sense to me how this even comes about in a person... Tweet