A set of 4 x nylon bristled medium replacement toothbrush heads quick and easy to change toothbrush heads just press the white button at the back of the toothbrush the low and high bristles effectively clean your back teeth as well as everywhere else reduce unnecessary waste by replacing the toothbrush head dentists advise you change your toothbrush heads every 3 months save money replaceable heads are cheaper than replacing the whole toothbrush free from pahs phthalates amphe