Book 10, Question 136
Why Should You Replace Your Toothbrush Every Few Months?
You should replace your toothbrush every few months because the bristles wear out and bend. A worn brush cleans less well, and it can collect germs, especially after you have been sick. Dentists suggest a new one about every three months.
More fun facts
- The American Dental Association suggests replacing your toothbrush every three or four months.
- Early toothbrushes used boar bristles shaved from a hog's neck, set in bone or wood handles.
- Those materials were expensive, so only wealthy people could afford toothbrushes.
- In the early 20th century, makers switched to nylon and other plastics.
- Scientists found that some chemicals from toothpaste can stay stuck in a toothbrush, one more reason a fresh brush helps.
Sources: National Geographic, Science News Explores, BBC
Questions kids ask
How often should I get a new toothbrush?
Dentists recommend about every three months.