Installing an electric toothbrush holder is a fairly easy process that can be completed in just a few minutes. The first step is to find a location for the holder that is close to an electrical outlet. Once you have found a suitable location, use a drill to create pilot holes for the screws. Next, insert the screws into the pilot holes and tighten them until the holder is securely in place. Finally, plug in the toothbrush charger and place your toothbrush into the holder.