back to the masking tape...
it's friction that causes the blisters...
what i do with my boots, is that i wear them for a few minutes, and
figure out which parts rub.. then stick masking tape over those
parts of my foot.. then socks..
the rubbing will be between the socks and the masking tape.. no
blisters...
OR...
if you know which part of the shoe is causing the rubbing, use
candle wax over that part.. or any other kind of wax that will
stick and smooth the rough part away...
biting isn't going to help 