Each year, 1 billion toothbrushes are thrown in the US. That is 50 million pounds of toothbrushes added to landfills and enough to stretch around the Earth 4 times. If every citizen uses plastic toothbrushes and replaces them every 3-4 months, that makes roughly 29 billion toothbrushes ending up in the rubbish bin each year. One average, the whole humanity would produce 600 million kilograms of plastic toothbrush waste in only 365 days.