I have unbearable toothache at night, but my dentist told me there's nothing wrong! what else could it be?

Something's wrong: There may be a cracked tooth, there may be a loose filling, you may be grinding your teeth. Hard to say without an examination. You might need a second opinion from another local dentist if your current dentist cannot locate the cause of your pain.

See an endodontist: Oral pain such as certain toothaches or cracked / fractured teeth can often be difficult to pinpoint. In addition to dental school, endodontists receive 2-3 more years of advanced education in this kind of diagnosis and treatment. That’s why you should see an endodontist.