Due to fluoride treatments, children can grow up without horrifying trips to dentist office until such trips were commonplace. The sentence looks like grammatical, doesn't it? Both sentences don't make much sense to be honest. I would rephrase as: Thanks to fluoride treatments, children can now grow up without horrifying trips to dentist. Unfortunately due to a lack of these in the past, such trips were commonplace. This sentence makes grammatical sense, doesn't it?

Sorry, this sentence really does not make sense. I can't understand the meaning - it's the "until.." that is confusing.