Why do my cats bite themselves when they're l*****g themselves?

Question

I have 2 cats and they both l**k themselves (of course lol), but they also bite themselves/their fur while they l**k themselves. I've always wondered why they do that. Does anyone know why?

Answer 1

They bite through tangled fur to straighten it out. It looks like they are biting themselves but they don't harm themselves. It's part of grooming.