RE: [상식타파] #6 치약없이 이 닦기

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[상식타파] #6 치약없이 이 닦기

in kr •  6 years ago 

불소가 송과체의 석회화를 불러온다고 합니다. 석회 결정이 생기는 거죠~ 그것때문에 치약을 안쓰게 된거죠~

kr
6 years ago by

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