大多数和我们谈话的医生对这个主意可并不欣赏——很多牙膏里含有像漂白剂那样的刺激性物质。
Most of the docs we spoke with weren’t crazy about the idea—lots of toothpastes contain irritants like bleaching agents. But it does work.
头发是死的，一旦其毛囊主轴受到挤压，其生物物质由于心理创伤或恐惧不能着色或漂白。
Hair is dead, and once the main shaft of the hair follicle is extruded, expired biomass can't be tinted or bleached by psychological trauma or fear.
一般的混合物包括柠檬酸钠，硼氢化钠(其也用于漂白木浆)和铵类化合物，所有的这些物质都对人体和环境有着危害。
Common mixtures include sodium citrates, sodium borohydride (also used to bleach wood pulp) and ammonium compounds, all of which can be toxic to humans and the environment.
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