I think Canada has it with Novamin, while the US doesn't. The Netherlands does, and Germany doesn't. All with the same "repair & protect" name. It's puzzling. Now Germany does have it under a new "clinical repair" name, of course the "clinical" ones in the US do not, those do contain soap for some reason (sodium lauryl sulfate) which I don't think I've seen in any other country.

I'm curious if there's been any evidence Novamin actually repairs enamel or "repairs" in some other way.

IIRC, it's not allowed in the states because it's not economical to prove that it actually repairs teeth, but I think my understanding is based on some internet comments and nothing else. The studies I've seen haven't proven to effectively repair enamel, I think, but I'm also not scientifically literate enough to understand the p values they report.

I used to buy repair and protect from Canada back in 2017 but haven't used it since then. I periodically check if there is any solid evidence but I haven't seen much or I'm too stupid to understand it.