You can regrow tooth enamel on your own right now. It's much, much slower than this and requires a criminally large amount of cod liver oil and butter oil (ie: vitamins A, D, K2 and calcium).
I'd suggest bone broth too. I don't know why my teeth are less sensitive when I have that regularly, but it's a clear effect, remineralization would be the obvious guess, and my dentist said to keep doing it.
Yup, you could also tackle your diet. Given the multifactorial aetiology of dental caries; Host, Plaque, and diet. I would highly recommend the least invasive approach; changing your diet. In addition to the noted vitamins, sucrose should not be included in your dietary program seeing as how it is a cariogenic constitute. There are other compounds that play a major role in the development of dental caries, but sucrose has that special something about it. Also, fluoride either in water (1.13ppm) or topical. Lasty, Xyiltol gum, it helps to rebalance oral pH. And of course brush and floss. This way, you prevent the development of dental caries--fingers crossed--and help in the reminiralisazion process.
1. The original comment was deleted. My comment would make more sense in context.
2. FUD is using false information to spread fear, uncertainty, and doubt. When someone claims nutritional supplements have some sort of miraculous medical benefit, that is FUD. It is FUD because it is almost certainly false information and it helps to create doubt and uncertainty of mainstream medical science.
3. If OP provides empirical evidence that using nutritional supplements regrows enamel, I will admit I was wrong. The wider medical community would also be very interested.
The researchers also have filed for a patent https://www.google.com/patents/US20140186273