What should i do if i have a tooth that is breaking away?

That's an easy one: Call your dentist right away. It still might be fixable.

See your dentist: If your tooth is breaking or chipping away, you should see your dentist as soon as possible. Even if you are not having any symptoms (pain/sensitivity), your tooth may crack further or may break in a way that will not be restorable. You may need a crown or filling on the tooth if it is chipping. Your dentist may also recommend a nightguard if you are grinding your teeth causing them to chip.

Pick up the phone: ....And go to the dentist! letting that tooth go will only lead to bigger costs and pain in the long run.

Fractured tooth: See your Dentist to discover the cause(s) of damage and to then choose the correct treatment