Getting your teeth ground down, eow! I've said it before, some of us suffer for our art.
The 0.8mm patches are what I use, they look like a bike inner tube patch. You can also get 0.3mm (I think) which are clear, I use them on my soprano 4c mpc, and haven't bitten through those either. Then again, I'm not a big biter.
Cheers, Bob