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Brace yourself

Brace yourself

作者:宗正洋镙  时间:2017-04-08 02:01:01  人气:

Dental braces may soon be less painful to wear. Braces are kept tight using rubber bands, but this can injure the gums and means the braces have to be tightened every four weeks. Now the Temple University School of Dentistry in Philadelphia has designed braces that replace the rubber with a hatch that swings up like a tiny garage door. Wires secured beneath the hatch give a gentler,