I have been bitten twice, by 2 different adult beardies. On both occasions, I voluntarily stuck my pointer finger in their mouths. Once to extricate a foreign object, once to open a mouth so that water could drain out. They bit out of instinct, not malice, and I was aware that I would be bitten. It does hurt, and does draw blood, especially when they use their bigger back teeth. I just washed them good with soap and water, and applied Neosporin and a Band-Aid. It hurts for a couple days. It was worth it, though, and I'm certain on the second occasion I saved her life.