Check out the ad for this mid-century "gum massager" called the Vibra-Finger, for "your personal use." As the name would suggest, it's a vibrating device, with a fake finger attached. And it's intended to massage your "gums," as recommended by the dentist. It's promises to stimulate "gum tissue," increase and improve circulation, and it's supposed to be refreshing. It's also suggested as a "useful gift." And how! (Click on image for larger version.) [Vintage Ads]