Yes, You Still Have to Floss. Here Is Why.

A few years ago, the Associated Press published an article claiming there was “little proof that flossing works.” The story spread quickly, and plenty of people took it as permission to drop the habit. The problem is that the conclusion rested on weak studies of a slow disease, and abandoning flossing on that basis is a mistake that can eventually cost you teeth.

What Those Studies Actually Showed

The AP reviewed the published clinical trials on flossing and found them unimpressive, which is true as far as it goes. Some trials lasted only two weeks. One examined about 25 people after a single use of floss. The AP itself acknowledged the evidence it reviewed was weak at best.

Here is the catch: gum disease and interproximal cavities take months and years to develop. A two-week trial cannot detect a disease that has not had time to appear. Wayne Aldredge, then president of the American Academy of Periodontology, made exactly this point when he called gum disease “a very slow disease” and noted that meaningful studies would need to follow people long term. Judging floss by a two-week trial is like judging a retirement plan by its first paycheck deduction.

So the honest summary is not “flossing fails.” It is “high-quality long-term trials are scarce, and the short trials we have cannot answer the question.” Those are very different statements.

The Case That Does Not Need a Headline

Set the studies aside and look at the mechanism, because it is directly observable. When you floss, material comes off your teeth: food debris and bacterial biofilm. Those bacteria metabolize sugars into acids that demineralize enamel, and they inflame the gum tissue they sit against. The tight surfaces between teeth are exactly where a toothbrush cannot reach, and they are among the most common places cavities and gum disease begin.

Floss is simply the tool shaped for that job, the same way a brush is shaped for the outer surfaces and a tongue scraper for the tongue. A complete routine uses each tool for what it alone can do, backed by professional cleanings for the tartar no home tool removes.

Technique Is Half the Battle

Dr. Aldredge made a second point that deserves more attention than it got: most people floss incorrectly. A vigorous back-and-forth sawing motion irritates the gum and misses the plaque at the gumline. Effective flossing curves the strand around each tooth in a C-shape and slides gently up and down, dipping just below the gumline, with a clean section of floss for each space. Before concluding floss does not work for you, make sure you are using it the way it is designed to be used. Our hygiene team happily demonstrates at any visit.

The Long Game, and What Is Riding on It

Compare a consistent flosser with a non-flosser after ten or twenty years and the differences are not subtle: fewer cavities between teeth, healthier gum tissue, less recession and bone loss, more natural teeth still in service. As a prosthodontist, I would add one more line to that ledger: the dentistry lasts longer too. The margins of crowns and bridges live at the gumline, and the tissue around dental implants can develop peri-implant infection when biofilm goes undisturbed. Patients who clean between their teeth daily protect both their teeth and everything we build on them. Our guides to daily gum care and implant home care pick up that thread.

So yes, you still have to floss. Not because a headline says so, but because the biology never changed.

If your gums bleed when you floss, or it is simply time for a cleaning and examination, call 202-244-2101 or request an appointment with Elite Prosthetic Dentistry in Friendship Heights, Washington, DC.