Electric toothbrush braces). The Broxo Electric Toothbrush was introduced in the U.S. by E. R. Squibb and Sons Pharmaceuticals in 1960. After introduction, it was marketed in the U.S. by Squibb under the names Broxo-Dent or Broxodent. In the 1980s Squibb transferred distribution of the Broxodent line to the Somerset Labs division of Bristol-Myers Squibb. The General Electric automatic toothbrush was introduced in the early 1960s; it was cordless with rechargeable NiCad batteries and although portable, was rather bulky, about the size of a two-D-cell flashlight handle. NiCad batteries of this period suffered from the Memory effect. The GE Automatic Toothbrush came
Ultrasonic toothbrush studied for almost the same period of time. In 1992, the US FDA first allowed the use of ultrasound at a frequency of 1.6 MHz in a toothbrush. In 1993, the American Institute of Ultrasound in Medicine (AIUM), in conjunction with the National Electrical Manufacturers Association (NEMA) developed the Output Display Standard (ODS), including the thermal index and mechanical index which have been incorporated into the FDA’s new regulations. These regulations limit the power output of these devices to a level low enough to avoid raising surrounding tissue temperature by more than 1 °C. Ultrasonic toothbrush An ultrasonic toothbrush is