Hi there. I went to the dentist two days ago because I have some tooth pain on one of the bottom front teeth. Basically it is very irritating, I guess I could perhaps say that the pain is kind of like a cold sensation. Coldness, chewing, and air does not seem to make it worse. The dentist took several x rays and examined the tooth and determined I did not have a cavity. Since the pain had just started the night before, I didn't worry about it, thinking it would go away. However, it has remained steady. I do frequently bite my nails, and it is the main tooth I use to bite my nails, and have several hairline fractures on the irritated tooth and the tooth next to it. I had read that cracks in the tooth could cause irritation, and I don't know if the dentist examined me with a light. Is this a possibility? What other things could cause this pain, and will it go away? What can I do? Thank you so much for all time, I really appreciate it.