2 columns of bristles. Can be used as both toothbrush and interdental brush. ●Features 2 types of bristles Ultraslim bristles and round-ended bristles. Easy to reach between teeth， tooth cervix and periodontal pockets where regular toothbrush cannot approach. 2-column bristles Slim head. Easy to brush lingual side of molars and areas around malaligned teeth. Bristle thickness　Root　0.17mm Materials　●Bristles/ Saturated polyester resin　●Handle/ PP Heat-resistant temperature　80℃ 【Advertisement】　P&A co. Ltd. (+81)72-367-7063