Truth Brush

Brushing your teeth probably feels more like work than play. But your toothbrush itself is kind of fun, right? When you look at it, it has all those little bristles in cute bundles, or tufts. So our fans Samantha and Gilbert O. asked, how many bristles are in the average toothbrush? We can’t be sure they all have exactly the same number, but orthodontists tell us that brushes have 2,500 bristles are grouped into 40 tufts. Does that work out evenly? Do the math to find out!

Wee ones: Look at your toothbrush. Pinch a few bristles between your fingers. How many of them can you count?

Little kids: Look at your toothbrush. How many tufts are in the longest row? How many other rows have the same number?  Bonus: How many tufts are there in total? Add up the tufts in each row!

Big kids: How many times do you think you brush your teeth in a year? How would you figure that out? (Reminder if needed: A year has 365 days.)  Bonus: Is 2,500 evenly divisible by 40? How will you figure it out?