I've noticed that on the back of toothbrush packages, it usually says that dentists recommend replacing your toothbrush every three months. I find that nasty. That's only four new toothbrushes a year. I feel like here's where sensible economic greed should enter the picture. Considering the nastiness of not replacing it at least once a … Continue reading Someone explain toothbrush replacement theory to me because I don’t understand economics.