In fact the secret of a good brushing, through forgetfulness of the technique used by a manual toothbrush, then you have to let the engine do the work. Slowly move the brush on the teeth, the ideal: to make one pass on internal and external surfaces of a jaw-quarter in 30 sec given by the timer of the Oral-B, and then farewell tartar! Finally: read the instructions and follow it by forgetting what has been learned during manual brushing ...