You Don’t Need to Floss Every Day (But Here’s What You Do Need to Do)

Your dentist has been telling you to floss since you were a kid. “Brush twice a day. Floss once a day.”

But what if that advice is not as solid as you thought?

In 2015, something surprising happened. The US government quietly dropped its decades-old flossing recommendation from the Dietary Guidelines for Americans. The reason? The effectiveness of flossing had never been properly researched.

This sparked headlines worldwide. “Toss your floss!” people cheered.

But that reaction missed the point. The real story is more interesting, and more useful, than “flossing is useless.”

What the Research Actually Shows

The 2016 controversy started when the Associated Press reported that the government had removed flossing guidance because the research did not support it. Dental patients everywhere felt vindicated.

But let us look at what the science actually says.

A 2019 Cochrane Review examined the available evidence on flossing. The conclusion: “Using floss or interdental brushes in addition to tooth brushing may reduce gingivitis or plaque, or both, more than tooth brushing alone.”

That sounds positive. But here is the catch. The reviewers rated the evidence as “low to very low certainty.” They could not say whether the effects were large enough to matter clinically.

A Journal of Dental Hygiene study found similar results. Researchers reviewed the evidence and found “very low certainty of evidence” for the ability of flossing to reduce gingivitis over one to six months.

Another systematic review published in Clinical Oral Investigations found that at one month, flossing showed a trend toward reduced plaque. But by six months, flossing “was no longer found to have any measurable benefit.”

The pattern is consistent. The evidence is weak. The studies are limited. And the benefits, when they appear, tend to fade over time.

Why the Evidence Is So Weak

Before you throw away your floss, understand why the research looks this way.

Most people floss poorly.

A 2025 study in Clinical Oral Investigations specifically asked: does proper flossing technique translate into effective plaque removal? The researchers found that when people improved their technique, their results improved too. But most participants started with poor technique.

The problem is not that flossing cannot work. The problem is that most people do not do it well enough to see benefits.

Self-reported data is unreliable.

Most flossing studies rely on people saying whether they flossed. But people overreport good behaviors. They tell researchers what they think researchers want to hear.

A study published as a preprint in 2024 noted this problem directly. The researchers found that “self-flossing may not be that effective” partly because they could not verify what participants actually did at home.

The right studies have not been done.

Researchers have pointed out that proving flossing works would require long-term randomized trials. That means randomly assigning some people to not floss for years. Ethically, that is hard to justify. Practically, it is hard to fund.

As one group of researchers wrote: “It is premature for health oversight bodies to conclude that flossing is ineffective.” The evidence is not there because the studies have not been done properly.

When Flossing Does Work

Here is where it gets interesting. Some research does show benefits.

A study of older adults published in the Journal of Dental Research found that flossing was associated with less periodontal disease, less tooth decay, and more teeth retained over time. People who cleaned between their teeth had better outcomes.

The same research group analyzed data from over 6,000 US adults in the National Health and Nutrition Examination Survey. They found that interdental cleaning was associated with fewer sites of gum disease, less decay between teeth, and more teeth present.

And in children, the evidence is stronger. A study found that professional flossing done for 1.7 years reduced the risk of cavities by 40%.

The difference? Professional flossing is done correctly. When technique is good, results follow.

The Cardiovascular Connection

There is another reason to care about cleaning between your teeth. It may affect your heart.

A 2024 study published in the Journal of the American Dental Association analyzed data from over 18,000 adults. The researchers found that flossing frequency was inversely associated with C-reactive protein, a marker of inflammation linked to cardiovascular disease.

A 2025 study in the Archives of Gerontology and Geriatrics found that regular dental floss use may reduce the risk of atherosclerotic cardiovascular disease.

The connection makes sense. Gum disease causes inflammation. Bacteria from your mouth can enter your bloodstream. Chronic oral infections stress your entire system.

Cleaning between your teeth reduces bacteria and inflammation. That benefits more than just your gums.

The Real Problem With Flossing

If interdental cleaning works when done properly, why do so many people fail at it?

It is hard to do.

Flossing requires dexterity. You need to wrap the floss around your fingers, maneuver it between teeth, curve it against each tooth surface, and move it up and down without snapping it into your gums. Most people never learn the proper technique.

It takes time.

Done correctly, flossing takes several minutes. Most people rush through it in 30 seconds or skip it entirely.

It is easy to skip.

Unlike brushing, flossing feels optional. You do not see immediate results. Your mouth does not feel noticeably different. So when you are tired or busy, flossing is the first thing to go.

The tools are not ideal.

Traditional string floss works well for people with good technique and normal spacing. But for tight teeth, wide gaps, braces, bridges, or arthritic hands, floss can be frustrating or impossible.

What Works Better for Many People

The research suggests something important: it is not about flossing specifically. It is about cleaning between your teeth effectively.

And for many people, other tools work better than string floss.

Interdental brushes

These small brushes look like tiny bottle brushes. You insert them between teeth and move them back and forth. They are easier to use than floss and may be more effective.

The European Federation of Periodontology recommends interdental brushes over floss for managing gum disease. They noted that where contacts are tight, floss can be used. But for most people, interdental brushes work better.

Water flossers

Water flossers use a stream of water to clean between teeth. They are especially helpful for people with braces, implants, or bridges. They are easier to use than string floss, though they require a power source and can be messy.

Floss picks

These are small plastic handles with a piece of floss stretched between two prongs. They are easier to maneuver than traditional floss, especially for back teeth. The technique is not as thorough, but something is better than nothing.

Soft picks

Rubber-tipped picks slide between teeth to remove debris. They are portable and quick. They may not remove as much plaque as interdental brushes, but they are better than skipping interdental cleaning entirely.

What You Should Actually Do

The debate about flossing misses the bigger point. The goal is to clean between your teeth. How you do it matters less than whether you do it.

Here is a practical approach:

Find a tool that works for you. If you hate string floss, stop using string floss. Try interdental brushes, a water flosser, or floss picks. The best tool is the one you will actually use.

Focus on technique. Whatever tool you use, learn to use it correctly. Ask your dentist or hygienist to show you. A few minutes of instruction can make a big difference.

Be consistent. Once a day is the standard recommendation. But if you can only manage a few times a week, that is still better than never.

Pay attention to trouble spots. Some areas of your mouth collect more debris. Maybe it is a tight contact between two teeth. Maybe it is around a crown or bridge. Focus your effort where it matters most.

Get professional cleanings. No home care replaces what a hygienist can do. Regular cleanings remove buildup you cannot reach. They also catch problems early.

The Bottom Line

The headlines got it wrong. Flossing is not useless. The research is just not strong enough to prove it works the way dentists have long claimed.

But that does not mean you should stop cleaning between your teeth.

Observational studies consistently show that people who clean between their teeth have healthier mouths. Cardiovascular research suggests benefits beyond oral health. And common sense says that removing food and bacteria from places your toothbrush cannot reach is probably a good idea.

The issue is not interdental cleaning. The issue is that string floss, done poorly by most people, does not produce measurable results in short-term studies.

Find a method that works for you. Use it regularly. And let your dentist help you refine your technique.

Your teeth will thank you. Your heart might too.