Rotary Electric Toothbrushes - These brushes have either a circular arrangement of bristles or they are arranged as in a manual toothbrush. When battery of toothbrush is switched on bristles of toothbrush start vibrating. Bristles move in an oscillating or pulsating motion at a frequency of 3000-7500 brush strokes per minute. The cleaning action of these brushes is primarily by scrubbing the teeth when oscillating bristles come in contact with the teeth. They can have 2 types of motions:
The electronic compartments of the powered toothbrushes are completely sealed so as to prevent any water damage. Electric toothbrushes are cordless and consist of rechargeable batteries. The indicator gauges are incorporated in the design of the toothbrush so that person using it may know the degree to which battery is charged and when does it require recharging. The base of the toothbrush is sometimes compact so that it can be easily carried while travelling and at other times it is quite large so that many brush heads can be stored in its base.
As there are no metal contacts in the tooth brush it gets charged when base of toothbrush is kept in contact with the charger by a phenomenon called inductive charging. The toothbrush and its base form a two-part transformer, such that base is having one part of the transformer and the toothbrush having the other. When electric toothbrush is slide onto the base, the complete transformer is created through which charge can flow. So, when base is applied to the charger, the battery gets recharged by the flow of charge through this transformer.
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