The early cord-powered electric toothbrushes

The early AC-powered electric toothbrushes posed a problem for the bathroom use due to the risk of electrical shock accidents, which was a solid reason for the public to turn towards the rechargeable electric toothbrush. The international regulations imposed strict rules by the end of the '90 regarding electrical bathroom cord-powered appliances, which were required to use a step-down transformer at the wall in order to decrease the voltage. Moreover many countries now require protected bathroom outlets, a measure that is in place in the US since he 1970's.