A piece of my molar fell off today and i probably have a cavity. what should i do while waiting for the appointment?

Use Dentemp: You can get dentemp in any drugstore to use a temporary filling.

See your dentist.: You need to see your dentist asap. While there is still a molar to fix. Are you waiting for pain? Abscess? Infection in your head? And more pain? The tooth will not repair itself.

See dentist: Most of the time this is caused by underlying decay, which cannot support overlying tooth structure. It can also be caused by a thru and thru crack either way, you need to see a professional asap. If you have pain, take advil (ibuprofen) 800 mg, every 4 hrs, until you get seen.