It should be enough to keep you from getting cavities on the smooth surfaces of your mouth. Some people, though, have cusps that didn't come all the way together on the back teeth; the pits and fissures that result from this can be impossible to adequately clean with normal hygiene, no matter how studious you are.
So if your fillings are all over the teeth, shame on you 😉 But if they're just on the biting surfaces, it may have been beyond your control.