I got a little scratch inside my cheek from my teeth. what should i do?

Check scratch: Sorry to hear that. Your body will heal it up quickly. Nothing special to do. If it swells or worsens over the next few days, see a dentist. If the tooth has a sharp edge, the dentist can smooth it off (or repair the tooth).

Little scratch: Usually there are no worries at all, although since our mouths are a bacterial haven they may become infected or may develop a traumatic ulceration. At any rate there are easy treatments for either situation however, they are not likely to happen in most cases.

Biting cheek?: Did the scratch develop over time or did it just occur, and has it been there for awhile. You may be subconsciously biting your cheek. A dentist may conservatively smooth the tooth edges, rounding the tooth/teeth to help. If this is a sore that has remained for a long time, definitely see a dentist and have it checked. Better to be safe.