I got them at an antique store in Cadiz Ky in 1999. I don't know anything about them. The topps sign came from an estate sale and I know it's real. The others...... I honestly don't know anything about them other than I paid between $10 and $100 for each one and I used them for decorating.
I think you are probably right on this one. I always wondered if the company's name was "dental sweet" or if that was what was in the can. I think this one is a reproduction but it sure does look and feel old.