Is it a sort of metal-like taste? It's probably blood. After extractions your sockets bleed out. Nothing to worry about, it'll clear up in a few days. Just be careful to take the home care instructions your dentist gave you seriously, if you don't you could develop dry socket. Dry socket is, for lack of better word, a bitch. Delays the healing process. I'm sure your dental surgeon can give you better advice on this then I can though
Good luck love!
Alice x