Why does my teeth hurt before getting a headache?

Sounds like sinus: This is classic when there is a sinus problem. The sinus cavities are almost touching the teeth. Get this checked out.

Yes: Headaches and tooth aches can be related. The most common relation would be with sinus headaches. The roots of upper teeth sit in the sinus so pressure from the sinus will give a headache and teeth to be sensitive or throb. Secondly, a tension headache which involves the muscles of head and neck may be referred into the jaw and the teeth.

Signs of clenching: Headaches associated with tooth pain can be a sign of clenching and/ or bruxism (grinding). The muscles of mastication involved become fatigued and overworked leading to the headaches. Usually the clenching takes place while sleeping placing undo stress on the teeth giving a soreness to the teeth followed by the headache.

Parafunction: Parafunction - clenching or grinding of your teeth can cause both of these symptoms. You may or may not be aware of this habit. See evaluation with your DDS. If you have this habit, a mouthguard may help.