Tooth brush...

A variety of oral hygiene measures have been used since before recorded history. The ancient Chinese were apparently the first to use toothbrush, which they made with bristles from the necks of cold-climate pigs. The first toothbrush to resemble the modern toothbrush is believed to have been invented in China in the late 1400s. The first toothbrush in America were manufactured in the late 19^th century, but toothbrush did not become a two or three times a day habit for many people until after world war II, when returning GIs brought their army enforced habits back to the U.S. by then DuPont had invented the nylon bristle, which unlike the natural bristles, dried completely between brushings and was resistant to the growth of bacteria. Nylon bristles are still used in most toothbrushes today. The first 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 Interplak, appeared in shops for the general public. There are currently many different varieties of model that use this mechanism.