A throbbing tooth, pressure in your face, a dull ache when you bend over—is it a toothache? Or is it a sinus issue? Sometimes it’s hard to know what you’re dealing with based on symptoms alone. So, how are you supposed to know whether to go see your dentist or take an allergy pill? Here are a few simple ways to tell the difference between tooth and sinus pain, so you can do the best thing for your health.