How is that not proving their point? Putting fluoride in water to topically apply it to teeth (and get a higher risk of brain damage and stomach cancer among o

How is that not proving their point? Putting fluoride in water to topically apply it to teeth (and get a higher risk of brain damage and stomach cancer among other things due to completely unnecessary ingestion). The study you linked is indeed like proving that drinking sunscreen is great at preventing lip cancer. Or better yet: maybe we can start putting sunscreen in drinking water to prevent lip cancer?