Exactly 2 weeks ago, I had all four wisdom teeth removed. About two days ago I noticed a white thing in the bottom left hole, and it wouldn't come out when I rinse. The hole used to be just, well, a black hole. Is this bone, or food?
It's probably a piece of bone from the extraction. It's not uncommon, especially in molar extractions and/or complicated extractions to have bone fragments and/or root fragments push out as the area begins to heal. It's not a blood clot. Blood clots are not white and in 2 weeks, the blood clot would've been dissolved or pretty much dissolved and the gum tissue would be healing over the socket. It's a possiblity that it is a piece of food, but it's more than likely a bone fragment. You can leave it be and it will most likely dislodge on it's own, or you can press on it with a Q-tip and try and break it loose from the gum tissue. If the area is not sore and no infection appears to be developing, than it is best just to let the bone fragment dislodge on it's own. If the bone fragment is irritating and or a small infection is developing, then try and gently remove it with a Q-tip. If you can't, then have your dentist/surgeon remove it for you.