Recurring Face Infections :(?

My partner has had 5 infections of the face this year already, and feels like another is on the way. there is no conclusion as to exactly what these are. the dentist performed an extraction during this time as he found a hairline crack in this tooth. THis releived the pain on that side of his face and he had about 10 days respite before going swimming and two days later getting immense pain along his jaw and side of his face. The pain did end up in his teeth too but it did not start there. He has been on another course of antibiotics for tha infection and the pain was so bad that co-codamol was not working and the GP put him on Tramadol. he has woken up the past two days with the familiar "tight" feeling in the same sid of his face. There is flushing on the cheek where it feels uncomfortable. he is basically steeling himself for the arrival of more excruciating pain in the next couple of day and then the GP prescribing more antibiotics. we have no idea why this keeps happening!