Brushing your teeth feels more like work than play. But a toothbrush itself is kind of fun, right? It has all those little bristles in cute bundles, or tufts. So how many bristles are in the average toothbrush? We can't be sure they're all the same, but orthodontists tell us that brushes have 2,500 bristles grouped into 40 tufts. Does that work out evenly? Do the math to find out!