 Those who advocate use of the bosal-style hackamore note that many young horses' mouths are too sensitive for a bit because they are dealing with tooth eruption, replacing primary molars with permanent teeth.While designed for use on young horses, bosals are equipment intended for use by experienced trainers and should not be used by beginners, as they can be harsh in the wrong hands.The bosal is ridden with two hands, and uses direct pressure, rather than leverage.