I opened the package, but it's unused because I bought the wrong item. Braun Oral-B replacement brush heads: Oral-B replacement toothbrush heads are developed in the US and use bristles made by DuPont. They are characterized by their durability and strong cleaning power, and are effective for preventing cavities and whitening teeth, making them popular worldwide. The tips of the bristles are rounded, allowing for gentle brushing without damaging teeth or gums.