Had teeth cleaned today now i feel sick why?

Probably Coincidence: Feeling sick is probably not related to your teeth cleaning. It's most likely a coincidence. Having your teeth cleaned is a very predictable & conservative procedure. If your gums are very unhealthy, it's possible that you swallowed some blood...That can make you feel nauseous. It's also possible that you swallowed a bit more Fluoride medicine than you should have...Same symptoms. It should pass.