Give me a manual toothbrush any day of the week. T'other day, the wife came home with one for each of us. Everyone else was excited, apart from me, who just thought 'this fucker's gonna rattle all me teeth out in about 5 seconds'. The first time I used it, it felt very unwieldy and made my teeth sore as fuck for ages afterwards - which I guess just shows that having a layer of tarter etc on yer teeth is probably actually very protective, because once mine had all been sanded off by this fuckin' machine I didn't half feel it...