Typically, the bad taste in your mouth after a tooth extraction is just blood. In order to get rid of the taste, gargle with some salt water and spit. Repeat the process until the taste disappears.
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Quite often it is blood. It can also be the sign of an infection starting - are you rinsing your mouth several times a day with salty water, for example? If the infection takes hold the taste will become one of terrible (rotten/vile) taste and make it very difficult to eat food as it will all taste terrible.