Sinus "toothache": A sinus "toothache" is a type of referred tooth pain caused by an inflammation of the maxillary sinus or a sinusitis. The roots of the upper molar teeth in the back of the jaw may be too close to the floor of the maxillary sinus and you perceive sinus pain like a tooth pain. Do not get any dental treatment done before checking your sinus.
Answered 5/30/2014
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Toothache: There are only 2 layers of cells between your sinuses and your upper molar root tips. Remote, but possible that you could have caused irritation. Sit down, bend over, put your head between your knees. If "toothache" gets worse it may be a sinus problem, see GP or ENT. If it doesn't worsen, may be an infected tooth problem, see Dentist or Endodontist.
Answered 12/13/2019
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