Well, a UK man who recently appeared on Channel 4's Embarrassing Bodies had never been encouraged to brush as a kid and had and never felt the urge as an adult.
The result was, well, truly horrifying.
Warning: graphic images
Fortunately, a doctor on the program was able to fit new veneers to the rotted stumps.
Throw in a shave and a hair cut and the guy looked half presentable.
The wonders of modern dentistry!
This article first published on Men's Health.