DS cut his 11th, 12th teeth (his bottom first molars) and has been biting his bottom lip the last cpl of weeks.

His lip and chin are so chapped from it

We try to distract him from it-- teethers, during meal times, etc... any one else LO do this? how long does it last? The teeth have cut through already, I think he just likes the sensation of biting against his new teeth...