my boyfriend went to the dentist because his tooth cracked, the dentist said it wasnt a root canal so they cleaned it and then put a grown on it, the grown felt loose so he went back and they did some more things to the tooth and then put another grown on it, he wont get his perm. grown till 5/6/2014. ever since he left the dentist on 4/18/2014 he has had this horrible pain he says he feels like the nerve. they said it shouldnt be hurting so he is going back tomorrow, i feel like they dont know what they are doing, every time he goes there for help they just add more pain. is this normal to have this pain while having a temp. grown on the tooth or is something wrong? please help