The left side of my teeth is painful and i have a headache on the left side of my face. ?

This would appear to represent a dental or jaw problem which is triggering secondary headaches. Start with your local dentist, and evaluate such issues as dental abscess or TMJ. Good luck.

Please see a local dentist to determine the cause of your pain and appropriate care.

May be infected tooth/teeth, gum disease, infected sinus, viral infection, and literally dozens of other possibilities. Important that you see your Dentist immediately.