中新网国际新闻: 研究：儿童刷牙用太多牙膏 或增加牙齿生斑风险

中新网国际新闻

研究：儿童刷牙用太多牙膏 或增加牙齿生斑风险 Feb 1st 2019, 10:44 　　中新网2月1日电 据台湾《联合报》报道，一份1月31日公布的调查称，美国有许多小孩刷牙时用了太多牙膏，这或增加他们长大后牙齿出现斑点或条状纹路的风险。

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