Now, three of the top 10 toothpaste brands on Amazon are fluoride-free, with the sub-category growing its market share to 29% as of April 1, up from 18% two years ago, Jungle Scout data shows.

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The public health practice of adding fluoride to drinking water is facing heavy scrutiny from the Trump administration, and toothpaste companies are being pulled into the fray now, too.

Robert F. Kennedy Jr. has gone after fluoride, a move that medical experts widely disagree with. Here's what health pros want you to know.

Robert F. Kennedy Jr. has gone after fluoride, a move that medical experts widely disagree with. Here's what health pros want you to know.

Robert F. Kennedy Jr. has gone after fluoride, a move that medical experts widely disagree with. Here's what health pros want you to know.

Robert F. Kennedy Jr. has gone after fluoride, a move that medical experts widely disagree with. Here's what health pros want you to know.

Robert F. Kennedy Jr. has gone after fluoride, a move that medical experts widely disagree with. Here's what health pros want you to know.

Robert F. Kennedy Jr. has gone after fluoride, a move that medical experts widely disagree with. Here's what health pros want you to know.

Robert F. Kennedy Jr. has gone after fluoride, a move that medical experts widely disagree with. Here's what health pros want you to know.

Robert F. Kennedy Jr. has gone after fluoride, a move that medical experts widely disagree with. Here's what health pros want you to know.