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Would you happen to have a picture you can upload ?
If you still have significant pain three weeks after your tooth was extracted, there is apparently a healing problem. There are several possibilities, but the hard chip at the edge of the hole suggests that some bone may still be exposed. This can be due to a couple of things. It is possible that the clot was dislodged from the extraction site, slowly healing and causing pain (dry socket). You may actually be feeling the bone of the extraction site. The other possibility is that there is a small piece of bone known as a "spicule" that is working its way through the tissue, which is fairly common. In any event, I would recommend that you call your dentist and consult with him or her regarding your symptoms. Healing does not generally tale this long and it is important to discover the underlying cause so that healing can be completed and you can regain your comfort quickly.
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