>>21181220they're sort of a scam and sort of not. You, if you are able to brush your teeth, do not need one. Statistically most people are incapable of mapping the teeth in their mouth in their head and using a normal brush to clean it completely. The electric toothbrushes are able to overcome this mental limitation and thereby produce statistical evidence that they are "good" overall.
If you can visualize your teeth while you use a brush and aren't too lazy to brush them all then the electric toothbrush is entirely unnecessary. Also, avoid western toothpastes.
