According to the Article, which of these happened before toothbrushes became widely available?
A. U.S. soldiers were required to brush their teeth every day, and they brought this habit home with them.
B. U.S. schools began teaching kids about the importance of oral health.
C. William Addis designed a toothbrush using a bone from his dinner and bristles from a broom.
D. Nylon was invented, replacing pig, cow, horse, and other animal hair as the bristle of choice.
C. William Addis designed a toothbrush using a bone from his dinner and bristles from a broom.
Before toothbrushes became widely available, William Addis is credited with creating one of the first modern toothbrushes in the late 18th century. This design utilized materials that were more accessible and effective than previous options, setting the foundation for the toothbrushes we use today.