Welcome to Justanswer.I will do my best to answer your question.I am not a great typist,be patient and feel free to ask if anything is unclear.After having extractions it is advisable not to do any heavy exercising for the first 48 hours.Extractions are really a surgical procedure which involves open blood vessels and bleeding.The reasoning behind the caution is that if your blood pressure increases,it is more likely that the sockets will bleed due to the increased pressure in the capillaries.If you take it easy,it is probably ok to swim.If you notice that you are having bleeding in the sockets,the best thing to do is to apply pressure with a gauze pad and bite down on it for 20 minutes.If a gauze pad is not available wetting a teabag and biting down on that will close the capillaries too.I would stick to a slow back float and avoid the competition butterfly stroke for the next day or so, then you should be fine.If you have any further questions please ask.