Dee my darling daughter chews everything to bits... all drink bottles, all pencils, textas... all of the ends are chewed to bits. She looks like she's had a fancy haircut, but its because she's eaten the ends of her hair off.... she's bitten her fingernails down to the quicks... and they bleed. Its part of the sensory stuff. I got a finger brush from work (to brush dogs & cats teeth with, its like a thimble that sits on the end of your finger) and I rub it on the insides of her cheeks to help get some of that out. Hasn't worked so far but I keep trying.