Has anyone tried Snap On Smile cosmetic dental appliance ?

You can find lots of YouTube videos of people trying them out, and most of the reviews aren't positive. Most of the reviews seem to indicate that the cosmetic device makes your teeth (and upper lip) look large and awkward. Plus, if you smile too much, the top of the device will show. And, depending on the color of your real teeth, they might contrast with the lower teeth quite a bit. At their price, unless someone is completely broke, they might be worth a gamble. If it doesn't work, they're not out very much money.

Oral surgeons, as well, one would also think, though they generally deal in much more complex cases, as a rule, I've observed....

Typically, I'd expect most genl dentists who've done GPR or AEGD residencies (the two genl dental residency types) would likely know about them, though I'd also expect most prosthodontists would certainly know of them, clearly, as such hardware is typically their principal thing....