I have a crack down the middle of my top front left tooth and the one underneath it too.
Why is that??
Idunno, it's now starting to bug me.
Cracks can cmoe from cavities or from a hard blunt trama (such as chewing on hard candy, something hitting your tooth, etc.)
You should really see a dentist as soon as you can so they can fix it. It will only get worse.
Cracks in your teeth can be caused from several things. Just go to your dentist so that it doesn't get any worse.
I did that tol but mine is chiped you should go to the FUC*I* DENIST