WONDER #1618: When Was the Toothbrush Invented?

Question 1 of 3

The first United States patent for a toothbrush was granted in what year?

  1. 1900
  2. 1776
  3. 1857
  4. 1938

Question 2 of 3

The first modern toothbrush was developed in 1938 with bristles made of what material?

  1. nylon
  2. boar's hair
  3. glass
  4. sandpaper

Question 3 of 3

Brushing teeth didn’t become a widespread practice in the United States until after what?

  1. 1900
  2. World War II
  3. fluoride was discovered
  4. dental schools were opened

Check your answers online at https://stage.wonderopolis.org/wonder/when-was-the-toothbrush-invented.