" ▁may ▁be ▁kept ▁on ▁the ▁brid le , ▁with ▁or ▁without ▁a ▁separate ▁set ▁of ▁re ins . ▁ ▁On ▁young ▁horses ▁started ▁in ▁a ▁s na ff le ▁bit , ▁some ▁western ▁train ers ▁use ▁a ▁light ▁ro pe ▁or ▁p enc il ▁bos al ▁as ▁a ▁loose ▁nose band ▁to ▁prevent ▁the ▁horse ▁from ▁gap ing ▁its ▁mouth ▁to ▁avoid ▁the ▁bit . ▁ ▁It ▁is ▁adjust ed ▁lo os ely , ▁but ▁the ▁material ▁is ▁more ▁st iff ▁and ▁un y ield ing ▁than ▁le ather . ▁On ▁hot ▁or ▁sensitive ▁horses , ▁a ▁standard ▁plain ▁cav ess on ▁similar ▁to ▁that ▁used ▁on ▁English ▁brid les ▁may ▁be ▁used ▁instead . ▁There ▁are ▁various ▁designs ▁of ▁bit less ▁brid les ▁that ▁incorpor ate ▁nose b ands ▁in ▁lieu ▁of ▁a ▁bit ▁for ▁control , ▁including ▁the ▁side pull ▁and ▁the ▁mechanical ▁hack am ore . ▁ ▁F itting ▁D ifferent ▁styles ▁of ▁nose band ▁are ▁fitted ▁according ▁to ▁their ▁purpose . ▁ ▁A ▁horse ▁must ▁be ▁able ▁to ▁part ▁its ▁teeth ▁and ▁open ▁its ▁mouth ▁slightly ▁( not ▁visible ▁on ▁the ▁outside ) ▁in ▁order ▁to ▁flex ▁correctly ▁at ▁the ▁j aw , ▁relax ▁and ▁come ▁onto ▁the ▁bit . ▁ ▁An ▁excess ively ▁tight ▁nose band ▁will ▁prevent ▁this . ▁▁ ▁If ▁a ▁horse ▁cannot ▁relax ▁its ▁j aw , ▁it ▁will ▁have ▁problems ▁with ▁proper ▁head ▁carriage , ▁and ▁the ▁r ider ▁may ▁then ▁try ▁to ▁force ▁the ▁horse ▁into ▁position ▁by ▁pulling ▁back ▁on ▁the