Preoperative etching improved the effect of the varnish in severe discolored fluorine teeth.
对于重度着色氟牙症,涂膜前进行酸蚀,可明显加强涂膜的漂白作用。
Any accidental release of fluorine could also be an issue: fluorine is a toxic and corrosive gas and, at high concentrations, can retard plant growth and damage teeth and bones.
氟气的任一次意外泄漏也都可能造成问题。氟气是一种有毒的腐蚀性气体,而且,在高浓度时,能阻碍植物生长并,损伤牙齿和骨骼。
Any accidental release of fluorine could also be an issue: fluorine is a toxic and corrosive gas and, at high concentrations, can retard plant growth and damage teeth and bones.
氟气的任一次意外泄漏也都可能造成问题。氟气是一种有毒的腐蚀性气体,而且,在高浓度时,能阻碍植物生长并,损伤牙齿和骨骼。
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