把牙齿染黑在本世纪初期以前是东南亚国家中的民族习惯,认为牙齿乌黑发亮是美丽的象征,且认为黑牙有防龋作用。作者于1968年在越南观察到350个因牙周病而拔下来的黑牙,没有发现一个龋齿。染黑牙的技术是一种酸蚀法,即在牙冠表面上贴敷切开的新鲜柠檬片,这样柠檬酸使釉质表面脱钙,粗糙,在两天两夜内反复更换新鲜切开的柠檬片;继之用黑颜料,生姜和芒果制成的混合染剂涂在小纸片上,然 Blackening the teeth Before the turn of the century was a national custom in Southeast Asian countries, it was a beautiful symbol that dark teeth were shiny and believed that black teeth had an anti-caries effect. In 1968, the author observed 350 black teeth pulled out from periodontal disease in Vietnam and found no dental caries. Black tooth technology is a kind of acid etching method, that is, the surface of the crown paste cut open fresh lemon slices, so that the surface of the enamel citric acid decalcification, rough, repeated replacement of freshly cut open in two days and two nights Lemon slice; followed by mixed with black pigment, ginger and mango dipped in small pieces of paper, then