How often do you clean your injectors?

I got some more fuel injector cleaner today, and noticed that on the bottle it says to use it every time you change your oil. I have been using it like every other tank of gas. Is this bad in any way? I can't imagine that keeping your injectors clean could possibly be a bad thing, but I just want to make sure that the chemicals in the cleaner isn't doing damage somewhere else in the engine since I am using it so often.