This is Dr. David
do you grind your teeth at night time when you sleep?
this can cause inflammation of your TMJ joint which can cause headaches
and TMJ inflammation of the Temporal Mandibular Joint which is the jaw bone can go behind the eyes and into the left jawbone as well.
a bite guard at night time between your teeth can take some of the pressure off of the TMJ joint to help lessen headaches.
also temporal or giant cell arteritis or trigeminal neuralgia could be causing these headaches as well.
you would need a brain MRI scan to check for trigeminal neuralgia.
I have false teeth I also have bad TINNITUS
Tinnitus in left ear