I did that a lot with my first LED, the StreamLIght Jr. Lux.
It's perfect for the task. If you got to change a car tire, there is hardly any other way. One time I had to change a Thermostat in a car, crawled on top of the engine bay and did it both hands wrenching, SL in the mouth.
Never chipped any teeth. Initially I tried to hold it with my lips as to not contact the teeth, but your lips eventually get tired and teeth take over before you know it.
Eventually, I ended up licking - or I guess eating all the paint off its end.
Then the germs. You touch bathroom door knobs, turn your StreamLight (where is the click on button located?) then you stick that whole device in your mouth. Hm?
It's a bad habit and I haven't done it in a long time. I am still sometimes awfully tempted to stick the MiniMoglite in the mouth, but resist. The finish looks very nice on it.