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 Toothbrushes contain billions of bacteria, how can you stay safe? Kathmandu. The small toothbrush you use to clean your teeth every morning and evening is actually a breeding ground for millions of microorganisms. The microorganisms on your toothbrush can have a variety of harmful effects on your oral and overall health. Our toothbrush is actually a small ecosystem where billions of microorganisms grow and thrive every day. The bristles of the brush are like a dry land, which when wet with water, become filled with nutrients for a while, turning into a suitable environment for bacteria. Millions of organisms live between these tiny plastic fibers. Concern According to studies, the toothbrushes we use can contain about one million to 12 million bacteria and fungi. They come from hundreds of different species and form a biological film on the surface of the toothbrush. When we brush twice a day, water, saliva, skin cells, and small food particles reach the bristles of the brush. Thi...