I think the most notable part of this claim is why wasn't this message deleted right away, and why were they drawing attention to it by saying "please disregard"? It's a purposeful streisand effect tactic
Interesting, I knew of someone who also claimed they reversed a cavity by focusing on oral care, and drinking a ton of milk.
Personally, I had a chipped tooth in my early teens and it went away after a decade. I was also drinking about a gallon of milk a day, but I don't know if that's what really fixed my tooth. I wasn't actively doing anything special with my teeth to try to fix them. I just really like milk. The problem just seemed to go away on its own.