I asked my dentist about novamin after it trended on HN a few months ago.
Apparently every toothpaste brand has a number of proprietary compounds that, according to their own research, is the biggest thing since flouride. Sensodyne has Novamin, I don't know the name of Colgates, but I am sure they list it on one of their websites.
Why HN has taken to Novamin, I don't know. Maybe it is because it was taken off the American market?
Anyway, it doesn't seem like Novamin makes a real difference:
According to a 2020 literature review,
> ... the objective of this review is to find out the current evidence available on the use of Novamin as an agent for remineralization.
> ... and at 6 months’ time point the p-value is 0.81 concluding that there are no significant difference of remineralization process obtained by using traditional toothpaste and Novamin.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7068624/