I had this problem some years ago. I'd developed an abscess under the crown & my dentist had to drill through it to do root canal work. If they did root canal on your tooth before the crown was fitted, then ignore meI had the crown put on my two front teeth Ten to 12 years ago. Now when I tap one of them hard, it hurts. I have a cold and a sinus condition, and head cold. Could these conditions contribute to why my crown hurts when I tap it. Thanks
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