Sometimes ( once in 15 days) I feel pain in my right upper molar tooth which goes away after taking painkiller. Though I can't locate the tooth in which I hv pain. Pain starts in right upper jaw and goes till my forehaed. Consulated 2 dentists, both said that with physical examination and in the xray also,there is no cavity or any sort of infection. Kindly guide what could be the possible reason of this pain.