Can you get a sinus infection from having a cavity filled or from the numbing agent?

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No, that will not cause a sinus infection.
Well, it isn't exactly that simple.....if it is an upper tooth and that tooth's roots rest right up against the maxilary sinus - like it does in many people - a deep cavity can irritate the nerve and the sinus will also become irritated. In the case of an extraction, there is a definite link between teeth and sinus infections. So, never say never.
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