‘Over’ versus ‘under’ toilet paper debate finally settled — by a scientist

They gave the over-under.

The position of a toilet paper roll may seem innocuous, but TP trustees have long been embroiled in a heated debate over the proper angle of the next square.

There are two types of people in the world: The “over” devotees who hang the roll so the on-deck wipe is facing the user, and the “under” fans who position it so it’s closer to the wall.

Thankfully, a professional has finally closed the book on the fecal matter — a whopping 250 years since the heinie hygiene tool’s invention.

Primrose Freestone, professor of clinical microbiology at the UK’s University of Leicester, says the somewhat counterintuitive “under” position is more hygienic and effective — despite the original 1800s patent showing the roll in the more natural-seeming “over” orientation, the Daily Mail reported.

“For the under position, there is less likely to be whole roll contamination,” Freestone argued.

That’s because “handling of the toilet roll from the over position” requires the user to employ two hands to extract a square after doing one’s business, per the microbiologist.

One hand is used to hold the roll in place so it doesn’t keep spinning forward and depositing too much paper, while the other takes the next segment.

On the other hand, the “under” method allows bathroom users to “pin the sheets against the toilet wall” and tear them off with the same mitt without “having to touch the exterior of the roll,” Freestone said.

By only using one hand to harvest a square, the odds of transferring hand bacteria to the toilet tissue and perhaps vice versa are reduced.

Meanwhile, using two paws increases the chances of spreading germs from one hand to the other.

“If someone who has wiped, say, once and the fecal matter has soaked through the layers of toilet paper and makes hand contact, the presumably right hand that did the wiping will likely be contaminated,” explained Freestone. “Then that right hand may contaminate anything it touches as the toilet user reaches for more toilet paper, which they then fold for wipe two, possibly touching the left hand as it does so.”

This is especially important given that both hands have, by the time we’ve sat down on the toilet, likely touched multiple microbe-laden surfaces from the doorknob to the toilet seat and lid. Even seemingly harmless items like bathmats are dirtier than toilet seats, research suggests.

Freestone said public restrooms are of particular concern due to excrement potentially contaminating the toilet door, stall, seat and other areas.

Women, meanwhile, are the most at risk of getting infected via accidentally transferring microbes from the groin to the genitals. On average, they also use more paper for both peeing and pooping.

Interestingly, Freestone’s theory is not shared by everyone.

Dr. Christian Moro, an associate professor of health sciences and medicine at Bond University in Australia, claimed that the “under” method is the “hanging” offense as it ups the likelihood that the toilet user will “touch the wall behind when fishing for paper, leaving germs behind on that surface which can be spread to the next user.”

Coincidentally, studies show that 70% of people still prefer it compared to 30% in favor of the “under.”