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[保健养生] 牙膏的简单妙用(让男人持久女人疯狂)

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建议不要这样做。。。。牙膏的主要作用是用来刷牙的,他里面的成分多半以 坚固牙齿  和杀菌的作用。  虽然薄荷确实有扩张血管、清凉皮肤、降低周围神经敏感性的作用,但如果清洗不干净,还会随着阴茎插入,残留在女性阴道内,刺激阴道黏膜,产生不适感。     牙膏中添加的香料等其他成分也可能刺激龟头和阴道黏膜,导致过敏。此外,现在牙膏的种类很多,添加的成分尚不统一,酸碱度也有差异,其中有些化学成分(如氟剂等),对于有生育要求的人来说,有影响生育的潜在可能。
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