Tuesday, August 07, 2007
The initial electric toothbrush was developed in 1939 in Scotland, but did not appear on the open market until the 1960s, when it was marketed as the Broxodent in the United States by Squibb. In 1961, General Electric introduced a rechargeable cordless toothbrush that moved up and down when activated. In 1987, the first rotary action toothbrush for home use, the Interlake, appeared in shops for the general public. There are currently many different varieties of model that use this mechanism. Research shows that they tend to be somewhat more effective at removing commemorative inscription and preventing gingival bleeding than manual toothbrushes and vibrating toothbrushes.
Posted by Best-Mature at 10:54 PM