How Often Should You Floss? The Evidence-Based Oral Hygiene Guide for 2026

Our current pick

How we compared oral hygiene methods and products

The standard advice on how often you floss is simple: once daily, every day, ideally before bed. The American Dental Association and most dental professionals have repeated this guidance for decades. But when you examine the primary evidence, the picture is more nuanced.

A 2019 Cochrane systematic review ¹ found weak and unreliable evidence that flossing in addition to toothbrushing reduces gingivitis at 1 and 3 months, and insufficient evidence that flossing prevents cavities. The quality of trials was low, sample sizes small, and many studies were at high risk of bias. This doesn’t mean flossing is useless, but it does mean the evidence supporting the universal daily mandate is thinner than most people realize.

What matters more than frequency is technique and consistency. A 2023 randomized controlled trial ⁹ found that proper flossing instruction and technique significantly reduced interproximal bleeding, but many participants in control groups (who were simply told to floss) saw no improvement. The method of interdental cleaning also matters. Network meta-analysis ² comparing string floss, interdental brushes, and water flossers found all three methods reduce inflammation, with interdental brushes showing slight advantages in accessible spaces and water flossers proving equally effective with less abrasion risk ¹¹.

We evaluated oral hygiene products and methods using three criteria: strength of evidence for plaque removal and gingivitis reduction, user satisfaction and adherence (because the best tool is the one you’ll actually use), and risk of harm (gingival abrasion, enamel damage, or ineffective technique). We prioritized systematic reviews and meta-analyses over single studies, and we flagged where popular advice conflicts with the data.

The result is a guide that answers how often you should floss (at least once daily IF you use proper technique, but interdental brushes or water flossers work just as well), explains how to prevent cavities through evidence-based mechanical cleaning, and recommends the one product that fits our standards for this category: a UV-C toothbrush sanitizer that addresses bacterial contamination, a hygiene factor most people overlook.

We compared interdental cleaning methods (string floss, water flossers, interdental brushes, floss picks) based on the clinical trial evidence, not marketing claims. For toothbrushes, we looked at electric versus manual comparisons ⁶, finding that oscillating-rotating electric brushes reduce plaque by 11% and gingivitis by 6% compared to manual brushing. The benefit is real but modest, which is why we don’t recommend premium electric models costing over $200 when basic versions deliver the same clinical outcomes.

The best electric toothbrush reddit threads often ask is one tool enough, or whether the best toothpaste recommended by dentist matters as much as technique. The evidence says: technique and consistency matter most, fluoride toothpaste is non-negotiable for cavity prevention, and interdental cleaning (by any effective method) is where most people fail. Mouthwash for bad breath treats symptoms but doesn’t replace mechanical plaque removal, and antimicrobial rinses like chlorhexidine ⁷ work short-term but cause staining with daily use.

We recommend Bril because it addresses toothbrush hygiene, a component of oral care with measurable bacterial load reduction and zero risk of harm. It’s the only product in our catalog that meets our evidence threshold. We don’t inflate claims or invent benefits to justify additional recommendations.

All 2 finalists, compared

Evidence rating reflects independent trial support for the product's concentration and protocol, not manufacturer studies. Scroll table sideways on small screens.

The 1 we recommend

Skip these

2 of the 2 kits we reviewed performed poorly enough, on evidence, value, or sensitivity, that we recommend against them regardless of price.

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