Hmmm, how bout getting the electric guitar properly shield for a start.
Then after that, used the freting hand to do some continuous tapping/hammer on/pull off while moving the head as if using the teeth for playing......
If not, use a looper pedal and fake it. Play the part where you want to fake with the teeth. After that whenever you need it, just lift up the guitar, step on the looping device and there you go :lol: