The authors of the paper wouldn't claim to know. They measured levels in urine and have no idea where that fluoride came from.
Oh, boy. This will be fun. To the (many) people in this comments section who seem unable to read, here's the conclusion of the study: "Community water and salt fluoridation, and fluoride toothpaste use, substantially…
The authors of the paper wouldn't claim to know. They measured levels in urine and have no idea where that fluoride came from.
Oh, boy. This will be fun. To the (many) people in this comments section who seem unable to read, here's the conclusion of the study: "Community water and salt fluoridation, and fluoride toothpaste use, substantially…