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金沙上网导航:Kinder to teeth

金沙上网导航:Kinder to teeth

作者:崔秋赈  时间:2019-03-07 11:15:11  人气:

By Barry Fox Brush your teeth too vigorously and you can end up with bleeding gums, damaged teeth, or both. So Unilever has filed a patent on a toothbrush that tells aggressive brushers when to ease off (W0 99/5935). A cavity runs along the inside of the handle of the otherwise ordinary nylon brush, and is filled with a piezochromic material which changes colour after a few seconds of excessive pressure. Having given its visible warning, the handle gradually reverts to its original colour. Alternatively, says Unilever,