I was skeptical that these heads would be as good as the original as usually you get what you pay for. With a son that likes to chew on his tooth brush a bit I was finding it costly to continually replace his head. They fit on our Sonicare tooth brushes perfectly, and also come with four different colour rings so we still know who's head it who's. These heads are much cheaper but the quality is still there! Very glad I gave these heads a try!!