Hopefully his ear drum is OK, they many times rupture and if all is well, they often repair them selves. In all cases of damage the time is to fast on fruits or fruit juice and allow the body to heal. It would also be wise to seek a light at your local drug store and look in his ear, if anything does not look normal, seek a specialist. I suggest a ruptured ear drum can heal on its own, but you should be careful and not take chances.