Left side of face is swollen headache all teeth on left side hurting and left ear extremely painful what's causing this?

Dental Abscess ?: Can't tell without an exam. Call your dentist for an emergency appointment.

Infected tooth: Can really answer your question except to tell you to see a dentist ASAP and get this checked.

A tooth abscess: A tooth abscess won't go away without treatment. A dental abscess is a collection of pus that forms in your teeth or gums as a result of a bacterial infection. The dentist will treat a tooth abscess by draining it and getting rid of the infection. See a dentist for a treatment.