Right side of my cheek that tooth hurts! do you think this is a cavity?

Maybe more: You may have an infection if your cheek hurts, too. Doesn't matter what we might guess your problem is... It needs to be seen and treated by a local dentist. Please call one in your area for an appointment.

See your dentist: You need to see your own dentist in order to diagnose the cause of your pain. It could be as simple as a canker sore or as severe as an infection.