Evidence check a specific claim separated from advice
Flossing or other interdental cleaning can reduce plaque and gingival inflammation beyond brushing alone
- Evidence quality
- Best supported for short-term surrogate outcomes; less certain for long-term disease endpoints.
- Confidence
- medium-high
- Last reviewed
- 2026-05-30
Inside the larger guide
This claim sits inside Is flossing necessary?
This page checks one premise in the broader answer. Open the guide when you want the full decision, the main tradeoffs, and the practical default in one place.
Full guide Is flossing necessary? Evidence: moderateHow to read this page
What this evidence check is doing
This page is for checking one narrower judgment carefully. Read it when you want to know what the evidence supports, where the limits are, and how much of the broader guide depends on this claim.
Focused evidence check
What this claim means
Bottom line
Cleaning between the teeth can help. The strongest sources in this set support a modest benefit for plaque control and gum inflammation when an interdental cleaner is added to brushing.
What seems true
The Cochrane review and the comparative review both point the same way: brushing alone misses some surfaces between teeth, and mechanical cleaning in those spaces can improve local plaque-related outcomes. That is the main reason flossing remains part of routine oral hygiene advice.
What is overstated or uncertain
What is less certain is how large that benefit is in everyday life and how much it translates into long-term outcomes such as cavity prevention, periodontitis prevention, or tooth retention. The evidence base is better for short-term bleeding or plaque measures than for years-long disease endpoints.
Practical meaning
For a low-risk person, this looks like a useful habit rather than a dramatic lifesaver. For someone with higher plaque-retention risk or a history of gum problems, the same modest average benefit may matter more because the baseline risk is higher.
Key sources for this judgment include Home use of interdental cleaning devices, in addition to toothbrushing, for preventing and controlling periodontal diseases and dental caries and An Overview of Different Interdental Cleaning Aids and Their Effectiveness.
That is enough to support a real practical judgment, but not enough to turn the claim into a universal rule for every reader or situation.
Source support
Main sources behind this claim
Supporting source
Home use of interdental cleaning devices, in addition to toothbrushing, for preventing and controlling periodontal diseases and dental caries
Cochrane Database of Systematic Reviews article by Helen V. Worthington and colleagues. Cochrane reviews are produced by evidence-synthesis experts and are designed to assess intervention effects across the literature, which makes this a strong source for the question even though the abstract here is more accessible than the full review.
This source is used to support the main claim that interdental cleaning can add benefit beyond brushing, especially for plaque and gingival outcomes, and that the evidence is weaker for hard long-term endpoints. Do not use it to claim that every person must floss daily or that floss is always the best device for every mouth.
Supporting source
An Overview of Different Interdental Cleaning Aids and Their Effectiveness
A peer-reviewed review article in the biomedical literature, written by dental researchers and published through PubMed Central. As a scholarly review, it has more authority than a clinic blog or commercial guide, though it is still a secondary source rather than a direct trial.
This source is used to support the practical claim that floss is not always the best interdental tool and that interdental brushes may work better in larger spaces or periodontal maintenance settings. Do not use it to claim that floss is useless or that one device is universally superior in every mouth.