Until now, the five second rule was your only hope for dropped retainers, clear aligners, night guards, partial dentures or athletic mouth guards (Oh! those nasty things) and other removable oral devices. They routinely get a quick wipe on the shirt and a kiss to the sky before being shoved back into the mouth - the entryway to every vital organ in your body!
But bacteria colonising on all these devices can be harmful whether dropped on the ground or not. Removable oral devices are simply home to lots of nasty characters most of the time. The critters start to grow as soon as you put the device in your mouth.