When cats groom themselves, why do they chew at their fur?

I get the licking part, but, why little chews at their fur?

I was just watched my kitty do a mad grooming session. And, apparently:

If you’ve ever watched a cat groom her face, you’ve probably noticed the highly stereotyped manner in which she does it: first, saliva is applied to the inside of one paw. Then, using an upward circular motion, the cat begins rubbing her nose with her paw from back to front. The cat will then reapply saliva to that paw and, using semi-circular motions, groom behind the corresponding ear, the back of the ear, the forehead and over the eye. When finished with one side, the process is repeated with the other paw on the other side of the head. After the head is clean, the cat grooms the front legs, shoulders, flanks, anogenital area, hind legs, and tail with long strokes of the tongue. The order of body parts may vary, and not all are necessarily groomed in one sitting.

Ah, kittehs.