According to science, the correct way to hang toilet paper is “over.” Why? Because “under” vastly increases the possibility that food-poisoning bacteria will spread from the restroom to the rest of the workplace.
Also to know is, should toilet roll be over or under?
The answer, as you can see above, is “over”—no surprise to the estimated 70 percent of wipers who already prefer this position, according to cnet.com. Proponents say an “over” roll provides easier access to the free end of the toilet paper and minimizes the risk of knuckle-on-wall germ gathering.