TL;DR — We checked eight braces-cleaning products at named US retailers and annualized them at one use per day. Yearly cost runs from about $29 for pre-cut super floss to about $106 for a branded orthodontic flosser, while single-use tools discard 365 plastic pieces a year against roughly 37 interdental brushes or 4 water-flosser tips. Three numbers were still not obtainable: how many threaders a $1.00 pack contains, a per-unit weight for anything, and an unambiguous pack count for one interdental brush.
All prices in this article were read at the named US retailers on 23 August 2026 and change without notice.
Figure 1 — Annual cost of cleaning between braces, one use per day
Cleaning between teeth once a day around fixed braces costs between roughly $29 and $106 a year in the United States depending only on which product you buy — and the gap in discarded plastic is wider than the gap in money: 365 single-use pieces a year at one end, about 37 interdental brushes or 4 water-flosser tips at the other. Every figure below comes from a price check we ran ourselves. The method, the arithmetic and the assumptions are written out, and so are the three numbers we could not get.
Method
We looked up braces-relevant interdental products at three named US retailers — Target, DentalStores.com and the Waterpik brand store — on 23 August 2026, recorded the listed price and the pack size exactly as shown, and annualized each one on a single, uniform set of assumptions. Where a product is not carried by a retailer we could check, we used the manufacturer's own US site and said so.
- One use per day, 365 days. The American Dental Association's own guidance is to brush twice daily and clean between teeth once a day; the same page notes that floss today is usually nylon filament or plastic monofilament, which is why the waste column is counted in plastic units.
- One unit per day for anything single-use: one pre-cut strand, one threader-floss piece, one orthodontic flosser.
- Interdental brushes at 36.5 brushes a year. This is our own editorial assumption of roughly ten days per brush, and it is the weakest number in the table — no source we used states an interval at all. TePe's own instruction is only to change the brush when the bristles collapse, with no interval given.
- Water-flosser tips at four a year, following the manufacturer's own three-month replacement interval.
- The reusable-holder row rests on two further assumptions of ours, not on any manufacturer figure: one holder discarded per year, and 18 inches of floss a day, which is where the ~167 m of filament comes from (365 × 18 in). No source we used sets either number. We picked one holder a year because it is the harshest plausible reading of a product category that is supposed to last; a holder that survives longer only improves that row.
- Prices as listed, before tax, before coupons, excluding promotions and subscription discounts. Fractional packs are not rounded up — we divide the pack price by the pack count and multiply by 365, which flatters the expensive products slightly.
Why these products and not ordinary floss? Because the archwire physically sits in the way. That barrier is documented in an unusually blunt place: a systematic review protocol on cleaning aids for fixed braces dropped an entire measurement index because passing floss into the interdental area would be very difficult with the arch wire in the way. The American Association of Orthodontists' own kit list tells patients to use a floss threader or pre-threaded floss to get around the wire. So braces wearers are pushed onto a shortlist of specialty products — and that shortlist is what we priced.
Ranking 1: annual cost at one use per day
| Rank | Product | Retailer, price checked 23 Aug 2026 | Pack | Unit price | Cost per year |
|---|---|---|---|---|---|
| 1 | Oral-B Mint Super Floss, pre-cut strands | Target, $3.99 | 50 strands | $0.080 | $29.13 |
| 2 | Water-flosser tips only (steady state) | Waterpik store, $14.99 | 2 tips | $7.50 | $29.98 |
| 3 | TePe Original interdental brushes, ISO 3 | Target, $21.99 | 20 brushes | $1.10 | $40.13 |
| 4 | Dentemp Braces Flosser | Target, $6.99 | 40 flossers | $0.175 | $63.78 |
| 5 | Oral-B threader floss for braces | Target, $6.99 | 30 threaders | $0.233 | $85.05 |
| 6 | Platypus Orthodontic Flosser | DentalStores.com, $8.69 | 30 flossers | $0.290 | $105.73 |
| — | GUM Proxabrush Go-Betweens Tight | Target, $16.99 | disputed | disputed | $15.50–$62.01 |
The single-use ranking is stable and the spread is real: at Target, a year of pre-cut super floss strands costs $29.13, while a year of branded orthodontic flossers from DentalStores.com costs $105.73 — a 3.6× difference for a daily task.
Two entries need their footnotes read out loud. The water flosser is second on running cost only because the appliance itself is excluded: Waterpik units were listed at $39.99 to $69.99 on Target's brand page, so year one is closer to $70–$100 and only later years land at $29.98. And the GUM Proxabrush cannot be ranked at all: Target's page titled the item "10ct" while also listing a package quantity of 40. Depending on which is right, the same $16.99 buys either $15.50 or $62.01 of annual use. We are not going to pick the flattering reading.
Ranking 2: annual discarded units
| Rank | Product | Discarded per year | Material mix |
|---|---|---|---|
| 1 | Reusable holder + floss spool | 1 holder (our assumption) + ~167 m of filament + ~3 spool containers | filament + container |
| 2 | Water flosser | 4 tips + 2 blister packs (plus the appliance, eventually) | plastic + electronics |
| 3 | Interdental brushes | ~37 brushes | nylon bristle on coated metal wire in a plastic handle |
| 4 | Pre-cut super floss | 365 strands + ~7 cartons | nylon |
| 5 | Braces flossers / orthodontic picks | 365 moulded picks + 9–12 packs | handle plastic + filament |
| 6 | Threader floss | 365 pieces + 73 envelopes + ~12 cartons | filament + envelope |
The waste column is counted in units, not grams, and that is a finding rather than a shortcut. Across every product page we opened, not one manufacturer or retailer published a weight per pick, per strand or per brush. Anyone quoting you a tonnage for braces flossing is extrapolating from numbers that are not on the label.
Figure 2 — Plastic pieces discarded per year, best first
The interdental brushes rank third rather than first on units but they are the hardest to recycle: nylon bristles bonded to plastic-coated wire in a moulded handle is a material sandwich no kerbside stream separates. Filament-only waste is at least a single material — the material question is covered separately in our filament comparison.
Peer-reviewed work points the same way as our unit counts. A life-cycle analysis of eight interdental cleaning aids, modelled on one person using them daily for five years, found that floss picks had the largest environmental footprint in 13 of 16 impact categories — 11.42 kg CO2e over five years against 3.07 kg for plain floss. The caveat matters: that study did not include braces-specific products, and it did not include a reusable holder at all. It is the nearest peer-reviewed proxy, not a measurement of the products above.
What we could not price
Three gaps, stated plainly because a price survey that hides its holes is worthless.
A plain floss threader is priced, but not counted. Sunstar's consumer page for GUM EEZ-Thru floss threaders lists them at $1.00 and describes the nylon loop and the packaging — but it does not say how many threaders that dollar buys, so the route cannot be annualized on the same basis as everything else, and two large chains blocked automated verification of a retailer cross-check. The threader-plus-spool route is still very likely the cheapest of all: a spool of nylon floss listed at $1.79 for 55 yards by ASINSIGHT, an Amazon sales-data aggregator, would cover our assumed 18 inches a day for about $5.94 a year, on top of a threader pack that costs a dollar. That spool price is a third-party aggregator reading, not a first-hand retailer check.
No unit weights exist, as above. And one pack count is contradicted on the retailer's own page.
What would change this ranking
Coupons and multi-buys, first: DentalStores.com was running a buy-two-get-one offer when we checked, which would cut the most expensive row by about a third. Second, the interdental-brush rows are hostage to a replacement interval nobody has measured, and to our own ten-day stand-in for it. Third, if any manufacturer published a gram weight per unit, the waste ranking could be redone in mass instead of count — and interdental brushes would probably move up. Fourth, a stated count on that $1.00 threader pack would let the likely-cheapest route be priced properly instead of estimated.
We will re-run this survey and date-stamp it again. The prices above are true of a handful of named US pages on one named day, and nothing more than that.
Disclosure: this article is published by LastObject, which sells reusable hygiene products and is taking pre-orders for a refillable floss holder. The ranking is built on prices from third-party retailers, and the section on where the product does not fit is longer than the section where it does — deliberately.
Related: what the microplastics evidence actually shows.
Figure 3 — The holder in the holder-plus-spool route
