What do sonic and ultrasonic electric toothbrushes do?
These toothbrushes claim to emit sonic or ultrasonic vibrations to the teeth to break down plaque. Ultrasonic frequencies start at 20,000 oscillations per second but, despite manufacturer claims, no electric toothbrushes currently on the market are even remotely close to achieving this. Sonic or ultrasonic electric toothbrushes tend to be very expensive, and dental experts are sceptical about whether they can transfer the vibrations to teeth. There is no proof that they remove plaque better than electric toothbrushes without sonic claims.
