How do you get rid of flea on cats?

If your pet will eat the garlic chopped up in its food than thats ok.I just mean make sure you know where the garlic has bee produced.In my country we have imported garlic as well as local and without sounding racist or paranoid the quality and chemicals found in the cloves I sure as heck would not be consuming and therefore would not expect my pets to either.Powder is easier to hide mixed in with the food as well.