I never heard of these kind of teeth supplements before this but in the era of supplements it came to no surprise, yet i didn't have the chance to try any products like this so i have no point of reference to compare.
I've been using these for about 3 weeks but i've accidentally skipped some days and i can tell that there is a difference, or at least a placebo difference on the smoothness feeling to my teeth enamel. Is it remineralization? Is it mechanical plaque removal from the gum? I do not know, but i know there is AT LEAST perceived improvement.
The taste is what you'd expect from a natural gum with natural flavoring that was aiming for oral health, so, no sugar, lightly minty and natural gum flavored, actually not bad at all and i found it somewhat pleasurable.
Overall i found that the package needed a lot of shaking after cooling down from shipping, some smacks against a hard surface so the cubes fell apart and still all of them and some of them more in an extent were melted into each other, not terribly but presentation could be better.
Price is another thing i found a little high, but i don't know what goes into manufacturing and marketing, so these days it's hard to judge for those, overall i think it works and took a star away only because of pricing and presentation (clumping)