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A sinus infection can cause an issue such as you've described. It is known as an oromaxillary fistula. There are several methods of surgical repair if deemed necessary. Often, a flap of the palate tissue is stretched over the fistula (hole). Sometimes a small piece of medical foil is used. In your case, if the hole is tiny, this may not be necessary. My recommendation would be to consult with an oral surgeon. He can assess the issue and discuss your specific options.
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