▁time ▁( 1 – 2 ▁hours ) ▁than ▁steam ▁aut oc lave , ▁therefore , ▁only ▁glass ▁or ▁metal ▁objects ▁can ▁be ▁ste amed ▁by ▁dry ▁heat . ▁▁▁ ▁Chem ic lave ▁by ▁using ▁Eth yl ene ▁ox ide ▁at ▁relatively ▁low ▁temperature ▁for ▁ 2 – 3 ▁hours . ▁▁▁ ▁Cold / ▁chemical ▁test ▁which ▁can ▁be ▁done ▁by ▁so aking ▁instruments ▁( he at - ▁sensitive ) ▁in ▁a ▁specific ▁chemical ▁solution ▁such ▁as ▁ 2 % ▁gl ut ar al de hy de ▁for ▁ 1 0 ▁hours ▁in ▁order ▁to ▁kill ▁b acter ial ▁sp ores . ▁However , ▁this ▁method ▁does ▁not ▁destroy ▁he pat itis ▁vir uses ▁and ▁sp ores . ▁ ▁Dis in fect ant ▁is ▁also ▁one ▁of ▁the ▁major ▁roles ▁of ▁dent al ▁assistant ▁where ▁chemical s ▁applied ▁to ▁in animate ▁surfaces ▁such ▁as ▁lab ▁to ps , ▁counter ▁to ps , ▁head rest s , ▁light ▁handles , ▁etc . ▁This ▁is ▁to ▁make ▁sure ▁that ▁germ ic ide ▁and / or ▁micro bi ost atic ▁are ▁achieved . ▁Ant ise ptic ▁chemical ▁agents ▁similar ▁to ▁dis in fect ants ▁but ▁they ▁may ▁be ▁applied ▁safely ▁to ▁living ▁t issue , ▁is ▁another ▁task ▁for ▁dent al ▁assistant ▁where ▁Al co hol ▁is ▁the ▁most ▁commonly ▁used . ▁ ▁Health ▁promotion ▁ ▁D ental ▁assist ants ▁make ▁a ▁difference ▁in ▁the ▁community ▁by ▁particip ating ▁in ▁health ▁promotion ▁activities ▁and ▁programs . ▁These ▁programs ▁may ▁take ▁place ▁at ▁schools , ▁pr esch ools