It is matter of if you are brusing properly rather than relying on performance of electric brush. Before plunge $$ for electric brush, try this. Get plaque disclosing tablet or solution from your dentist's office or drug store. Brush with your usual brush, then try disclosing tablet. It will show you if your brushing technique is good or not. Most time, you will find habitual brushing which may leave out plaques on your teeth. If you tend to brush with force, meaning brushing hard, get a soft brush. If you are inclined to get electric brush, Rotadent is a good electric brush. Not widely known but many hygienist would recommend it. For me, again, it is matter of proper brushing technique over technology.