Electric tooth brushes are awesome and affordable. The Philips Sonicare 2 Series Plaque Control Sonic Electric Rechargeable Toothbrushcan remove more tooth-decaying plaque and help your dad avoid cavities. The snap-on proresults plaque control brush head features curved bristles to match the shape of your teeth for a superior clean that removes up to 6x more plaque than a manual toothbrush. The easy-start feature slowly increases the power of the brush as you get used to the sonicare experience and the smartimer encourages a full 2 minutes brushing time. An ergonomic handle with intrinsic grip makes it easy and comfortable to hold the brush, and the two-color battery charge indicator lets you know when it’s time to recharge. For under $40 this is a good product.