Disclosed is an interdental tooth cleaning appliance for use in cleaning a space formed between adjacent teeth. In order to clean more effectively as compared with a known appliance, the cross-sectional shape of the bristles as seen in a plane perpendicular to the longitudinal axis of the brush is such...http://www.google.es/patents/US4828420?utm_source=gb-gplus-sharePatente US4828420 - Interdental tooth cleaning appliance
