the invention is directed to a bristle for a toothbrush , in particular for an electric toothbrush , which is made of plastic and includes several filaments joined together . the filaments are wound or braided and joined together as a result of the action of chemical agents . this results in a firm bond between the filaments , and any cavities between the filaments are reliably avoided . overall , a toothbrush results which , in addition to having a high cleaning effect , offers bacteria or other germs no possibility of infiltration .