Dr. should evaluate
A doctor or a dentist can evaluate a problem in the teeth, gums, or cheeks (although a dentist is likely the better choice for teeth and gums problems).
in the cheeks usually means some infection, and the doctor may prescribe antibiotics. If the infection spreads, it may go throughout the face, and more seriously, maybe into the sinuses and towards the brain. Getting treatment is wise.
Answer assisted by Mike Moore, Medical Student