I have been suffering intermittent toothache in upper front tooth for over a year now. X-rays show no problems in that area. Have had root canal treatment and then extraction of upper right 5 which was bothering me and I thought that may solve the problem but it has come back. The strange thing is I do not have the pain all the time but I do have it most of the time and I cannot identify what causes it. Have also tried antibiotics which have not helped. Does anyone have any ideas.
I had a toothache for a long time that xrays showed nothing. It was on a back molar though. The toothache just got worse and worse until I finally had it extracted. The oral surgeon said it was cracked which he could not see the crack until after he extracted it. Cracks do not always show up on xray. Well mine was a crowned tooth so maybe thats why the crack did not show up. It had been previously root canaled as well. The extraction did releive the pain. I am not recommending this for you just telling you how my unexplained toothache was solved. One way to diagnose a cracked tooth is when the dentist use his little hammer on it it hurts - mine hurt way worse for a week after being hammered on. Sharp pain when biting down on it is another symptom.
Do you clench and or grind your teeth? When your teeth are hurting do you get headaches, ear pain, eye pain? Might be worth looking up TMJD, bruxism...Clenching can bring about various pains. Hope you find answers.