Brush Your Teeth
You must brush your teeth once a day, if not twice a day which is a regular routine for most every morning and night.
When It Started
People started brushing their teeth in 3000 B.C. with twigs. The first mass produced toothbrushes were produced in 1780 in England. They were available in the U.S. at the end of the 19th century. However toothbrushes weren't widely used until after WWII.