WONDER #1618: When Was the Toothbrush Invented?
Question 1 of 3
The first United States patent for a toothbrush was granted in what year?
Question 2 of 3
The first modern toothbrush was developed in 1938 with bristles made of what material?
- boar's hair
Question 3 of 3
Brushing teeth didn’t become a widespread practice in the United States until after what?
- World War II
- fluoride was discovered
- dental schools were opened
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