New High Quality Bristles Softness: Adult Medium. The American Dental Association (ADA) recommends replacing your toothbrush every 3 months. After normal wear and tear, your bristles begin to wear away, creating a less effective toothbrush. Clinical studies show that worn toothbrushes remove less plaque than new toothbrushes. Solid Bamboo Handle Biodegradable handle and bristles. Your toothbrush can accumulate a lot of bacteria, so common sense practice also recommends replacing your toothbrush every 3 months. No pollution. Highly sustainable wood panda friendly for adults. It's also a good idea to replace your toothbrush after an illness. Keeping the Earth Green, Almost 50 million pounds of plastic toothbrushes make it to our landfills every year. Material: bamboo fiber Length: 18.5 cm, bristles: 12 mm. All this plastic can take 1,000 years to decompose and can even leach contaminants into the surrounding soil and water. Bamboo is environmentally friendly because it grows super fast, growing over 3 feet per day, and bamboo can grow in close quarters. List: 10*Toothbrushes