Its recommended to change out your toothbrush every 3 months. After normal wear and tear your bristles start to get worn out creating a less effective toothbrush. Clinical studies show that a worn-out toothbrush removes less plaque than a new toothbrush. Your toothbrush builds up a large number of bacteria, so common sense practices also suggests replacing your toothbrush every 3 months.
It is also a good idea to replace your toothbrush after getting over an illness. Keep the earth green Almost 50 million pounds of plastic toothbrushes make it to our landfills every year. All that plastic can take up to 1,000 years to decompose and can even leak pollutants into the surrounding soil and water.