I gave a Sonicare toothbrush to my son and the rubber on/off pressure button had ripped making it impossible to use without getting water in it. That's why sugru worked so well to still allow the flexibility of the on-off but keeps it water tight at the same time. I used a drop of black sugru to highlight the sweet spot for the on-off. My son loves the fix and I think is even brushing more than before. Ross, Florida.