I don't care if people use this or not, in my book that doesn't count as cheating other than yourself, reason is what I write below:
I cannot se that butting up to a ledge would help training smilelines, and since you would still have to move the smile line at the rebalance, either you would have to remove all and put a new tip on or hand make them.
This way you may be doing smile with a white powder, but you can do faster with white tips, and have pretty much the same look.
If you want to practice smilelines and need a guide, then use thin well-less tips, with fairly deep smiles, like performance from CND, and use that as a guide, and if you want to be fast overlay with a clear or pink, or even faster a PopIt.
I think that the problem is that everything out there (that I have seen) that's designed to help smilelines (or even keep you from doing them) is all creating a kind of uniform look. I know different white tips with different deep smiles, but I find it hard to customdesign the smile, like I do with my white, and even custom blend the white.
I do make nails with white tips, cheaper, but honestly only teenagers or people one off is having them, all of the others want the hand made ones, and I'm not even near good yet.
So I cannot see how it would work for me, as everybody can get a hold of white tips, and everybody can but white up to a ledge (talking about techs here) but not every one can se, and do, the shape of the smile that suits the clients individually. And thats how I make money, and make myself stand out in the crowd of techs...
Just my thoughts:hug: