i use tweezers to feed supers to my guy. he bites the tongs out of excitement, so i certainly wouldn't want to put my fingers near him!
he accidentally bit me once when i was feeding him (when he was still young), he didn't draw blood but he looked SOOO upset! he got low and stared at me with sad eyes.
now with my smaller female... she 'accidentally' nips my fingers and looks like it's my fault she missed the food.
now i never thought biting would hurt bad because i had an iguana before, and he bit me on several occasions (NEVER touch their strawberries!!!). then i realized the big difference was that bearded dragons had teeth. :shock: