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After a tooth is extracted, it is advisable to keep the gauze in the site for 30 minutes, in the same position. After 30 minutes, do not spit, take the gauze through your hand and discard. This is to arrest bleeding and help in clot formation by pressure method, and spitting will lead to dislodgement of the clot. So, be careful with splitting (do not do it forcefully) for at least one day. I hope you have got the other instructions from your dentist.