Ads for 'Dental Gum Massager'

Here is something I came across that is good for a chuckle:

http://www.vintag.es/2017/04/in-1950s-dentists-recommended-this.html

Talk about an anatomically correct masturbator, a finger no less!

I'm sure one of the reasons we don't see that any more is it plugs into 120 volts. I'm pretty sure that's the main reason the Broxodent electric toothbrush died while others that were battery powered flourished.