Effect on last molar teeth , My friend had tooth ache with pain of last 6months ago he consult a dentist, so dentist suggested that to have a filling . so my friend made permanent filling after this he is ok but for now recently a month ago he had lost his filling and the some of the layer . this is the X-raywhich I have shown up...so what is the present situation of the tooth ?? & what is the diagnosis to be done further??? Either the tooth to be filled again or it should be extract ???