I carry a 1-AAA twisty light in my pocket all the time, and fairly often hold it in my mouth to free up the hands. But it’s so light weight, it’s just between my lips and I’m not really biting down. I figure my pockets are clean from the laundering, and my light isn’t really dirtier than my own hands or mouth (do you realize how many bacteria live inside the human mouth? A lot!!). So, no big deal.
Hey, we all have lights we drool over, right? 
Whatever doesn’t kill ya, makes ya stronger! 
Would I be out of line to say that this thread literally bites? 