I bit the inside of my cheek, real hard, to make myself focus.

He bit down hard on the inside of his cheek.

I'd gone through the first part of his cheek and kept on going.

She bit down hard on the inside of her cheek.

I had one of my cheeks cut half way through.

She could see only the side of his cheek clearly.

Quickly he put it back in the safety of his cheek.

I bit the inside of my cheek until it hurt.

She bit the inside of her cheek to keep from crying.

Has a scar on one side of her cheek, by a cut.