It is impossible to guarantee that you will ever “permanently” rid your home of roaches. Roaches are naturally occurring in nature and, therefore, will always be all around your home. Preventing the roaches from coming into your home requires constant attention to creating a barrier between the inside of the home and the outside world. The best method is to use a residual insecticide on the outside of the home that the roaches will need to cross to get into the home.