There are 7.6 billion people on the planet. Each of us will use 300 toothbrushes during our lifetime (4 toothbrushes per year). A conventional toothbrush weig

There are 7.6 billion people on the planet. Each of us will use 300 toothbrushes during our lifetime (4 toothbrushes per year). A conventional toothbrush weighs approximately 18 grams. Each of us will throw away about 12 pounds of plastic toothbrushes in our lifetime. Plastic toothbrush waste generated during our lifetime = 80 billion pounds! I read about the 2 billion a year in an article that I can't find at the moment. I will do some more research about this and remove the quote for now. Thanks for your calculation and for pointing this out!