Electric tooth brushes.

My grown up children and my little grand children all use electric toothbrushes and seem to have had little or no dental treatment since using them.

As an experiment I bought a child's battery operated toothbrush but it makes me nervous and I'm worried that it will dislodge my fillings of which I have a LOT including a crown on one of my teeth near the front.

Any experiences of electric toothbrushes would be very much appreciated.