> that's like taking the surviving bacteria "to the gym", clearing out the normal flora of bacteria, and replacing it with whatever nasties can survive your tre

> that's like taking the surviving bacteria "to the gym", clearing out the normal flora of bacteria, and replacing it with whatever nasties can survive your treatments. That argument holds for any point on the "target clean level" curve, though... for example I could use it to argue that flossing is cleaning beyond what's optimal. Not that I think it, but what is the best strategy, long term?