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Once the tooth has been pulled, a blood clot usually forms in the socket. The dentist will pack a gauze pad into the socket and have you bite down on it to help stop the bleeding. Sometimes the dentist will place a few stitches -- usually self-dissolving -- to close the gum edges over the extraction site.
This usually occurs within the first few hours or first few days after a tooth extraction. If you see blood whenever you spit out saliva, it is a pretty strong indication that the blood clot has fallen out of the tooth socket.