What are the benefits of flossing?

Flossing removes plaque and food particles between teeth and under the gumline that brushing misses, helping prevent gum disease, cavities, and bad breath. The strongest evidence is for reducing gingivitis when you floss and brush together.

Is flossing really necessary?

Yes. While some headlines questioned the evidence, dental and NIH guidance still recommend daily flossing because it cleans areas a toothbrush can't reach — a low-risk, low-cost way to reduce plaque before it hardens into tartar.

Should you floss before or after brushing?

Flossing before brushing is often recommended because it loosens debris so fluoride toothpaste can reach between teeth. That said, either order is far better than not flossing, so pick the one you'll actually keep up.

How do you build a flossing habit?

Stack it onto brushing so it happens at the same time each day, keep floss visible on the counter, and track a daily streak to stay consistent. Anchoring the new habit to one you already have removes the need for willpower.

Benefits of Flossing: Why It Matters (2026)

Q: How often should you floss?

Dentists recommend flossing once a day. Doing it consistently matters more than the time of day, though many people prefer to floss before brushing so fluoride toothpaste can reach the cleaned spaces.

TL;DR. The benefits of flossing come down to reaching the roughly 35% of each tooth's surface that a brush can't touch — the tight spaces between teeth and just under the gumline. Doing it once a day removes plaque and trapped food that cause gum inflammation, cavities, and bad breath. The strongest evidence is for reducing gingivitis when you floss and brush, shown across pooled trials at 1, 3, and 6 months (Cochrane review, via PMC; NIH NIDCR). This is general health information, not dental advice — your dentist knows your mouth best.

Flossing is one of those habits almost everyone knows they should do and most people quietly skip. The good news is that the reason it works is simple, and the reason it's hard to keep up has a fix. Below is an honest look at what the research actually shows — including the headline a few years back that questioned flossing entirely — plus a practical way to make it stick.

What flossing actually does

Your toothbrush is good at the fronts, backs, and chewing surfaces of your teeth. It's poor at the contact points where two teeth press together and the narrow strip of gumline between them. Those surfaces make up a meaningful share of every tooth, and they're exactly where plaque likes to hide.

Plaque is a sticky film of bacteria. Left alone between teeth, it feeds on sugar, produces acid, and irritates the gums. Within a day or two it starts to harden into calculus (tartar), which a brush can no longer remove (NIH NIDCR).

Floss disrupts that film before it hardens. That's the whole mechanism — physically dragging bacteria and food debris out of the gap. Interdental brushes and water flossers do a similar job, so the point isn't the string specifically; it's cleaning between the teeth at all.

The benefits of flossing

Here's an honest benefit table. Some effects have strong short-term trial evidence; others are real but more modest or still classed as associations rather than proven cause.

Benefit	What the evidence shows	Source
Less gum inflammation (gingivitis)	Flossing plus brushing reduced gingivitis and plaque versus brushing alone at 1, 3, and 6 months across pooled RCTs	Cochrane review, via PMC
Cleaner spaces a brush can't reach	Interdental cleaning removes plaque between teeth and under the gumline before it hardens into tartar	NIH NIDCR
Fewer cavities between teeth	Removing trapped food and plaque limits the acid that causes decay in contact areas	Penn Dental Medicine
Fresher breath	Clearing decaying food particles reduces a common source of odor	UIC College of Dentistry
Possible whole-body links	Gum disease is associated with heart and other systemic conditions — an association, not proven cause	Penn Dental Medicine

The last row matters for honesty. You'll see claims that flossing protects your heart. What research shows is that gum disease and cardiovascular disease often appear together — a link, not proof that flossing prevents heart attacks. Keep the reasons to floss grounded in the gum-and-cavity benefits, which are the solid part.

How often should you floss?

Once a day. Every major dental and health body lands on the same recommendation, and there's little evidence that more than once daily adds much.

Timing matters less than consistency. Many dentists suggest flossing before brushing so you loosen debris first, letting fluoride toothpaste reach between the teeth afterward — but flossing at any time of day beats not flossing at all (Penn Dental Medicine).

If you're the type who forgets by bedtime, do it whenever you reliably brush. A floss you actually do beats a "perfect" one you skip.

The honest evidence picture

In 2016, news outlets ran a wave of "flossing might be useless" stories after a review found the long-term studies weren't strong. It's worth understanding what that actually meant, because the headline was misleading.

The gap isn't that studies disproved flossing. It's that large, multi-year trials are hard to run — you'd have to assign people to not clean between their teeth for years and wait for disease to develop, which is expensive and ethically awkward (Cochrane review, via PMC).

The NIH's dental institute is direct about this: limited long-term data "doesn't mean that flossing is not effective." They describe it as "a low-risk, low-cost way to clean parts of your teeth where your toothbrush can't reach," and short-term trials do show modest benefit (NIH NIDCR). More recent RCT evidence has since strengthened the case for reduced gingivitis. So the balanced verdict: the daily-flossing recommendation still stands.

How to make flossing a daily habit

Knowing the benefits of flossing changes nothing if you don't do it. The reliable fix isn't more willpower — it's attaching floss to something you already do without thinking.

Two linked cards, one showing a toothbrush and one showing floss, joined by a glowing arrow next to a streak tracker

This is called habit stacking — anchoring a new behavior onto an existing one. Your brushing routine is the perfect anchor because it already happens on autopilot at a fixed time. The formula is simple: "After I pick up my toothbrush, I floss first." Learn more about the technique in our guide to habit stacking.

Three moves make it stick:

Stack it onto brushing. Same sink, same time, every day. The existing habit carries the new one.
Keep floss visible. Leave it on the counter, not in a drawer. Out of sight is out of mind — a cue you can see is a cue you'll act on.
Track the streak. A daily check-off turns an invisible habit into visible progress, and not wanting to break the chain becomes its own motivation.

If you tend to start strong and fade, the missing piece is usually a system, not discipline — our guide on how to be consistent breaks down why. Flossing also pairs naturally with the small daily wins in a broader self-care habits routine, and it's an easy add to any tracking-habits setup you already run.

That last step is where a tracker earns its place. A daily floss check-off in HabitBox gives you a streak to protect and a calendar heatmap showing your consistency at a glance — the visual nudge that keeps a two-minute habit from quietly disappearing.