A sinus infection can cause an ache in the tooth — primarily in the upper rear teeth as they are near the sinuses. With the pressure building up in one's head, a nasty ache in the tooth is common. The pain, therefore, related to the tooth is not tooth pain, but your sinuses instead cause it. Typically, tooth pain because of a sinus infection is bilateral, which means it pains on both sides of the facial muscles. And in case you push down the tooth, you don't feel shrieking in the tooth. Over-the-counter decongestants can help relieve tooth pain related to sinusitis.
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