Cotton rolls, dry angles, gauze and saliva ejectors handle most everyday moisture control in a dental practice, and each one does a different job. Cotton rolls isolate beside the teeth, dry angles absorb saliva at the parotid duct, gauze wipes and applies pressure, and low-volume suction removes pooled fluid. This guide covers how to choose and stock each one, with current EBIKO Dental pack sizes and prices in CAD.
Moisture control rarely gets its own line in a practice budget, yet it touches almost every appointment: sealants, bonding, composite placement, fluoride, impressions and routine hygiene. This guide reflects EBIKO Dental's range and prices as of October 2026. Where rubber dam is not practical, relative isolation with absorbents and suction is what stands between a dry field and a contaminated bond. This guide walks through the four workhorse categories, when each one fits, and what to look for when you restock.
Why moisture control still matters
A 2021 Cochrane review on isolation, "Rubber dam isolation for restorative treatment in dental patients" (Miao et al.), opens by stating that "the effective control of moisture and microbes is necessary for the success of restoration procedures."
That same review is worth knowing in detail, because it compares rubber dam directly with cotton rolls. It included six studies with 1,342 participants, five of which compared rubber dam with cotton roll isolation, and all of which the authors rated at high risk of bias. Their conclusion: "some low-certainty evidence" that rubber dam "may lead to a lower failure rate of the restorations compared with cotton roll usage after six months," with very uncertain evidence at other time points.
The practical reading for practices in Toronto and across Ontario is not "never use cotton rolls." It is that the best available evidence is limited and low in certainty: it suggests rubber dam may lower the failure rate of direct restorations compared with cotton rolls at six months, but beyond that the evidence is very uncertain. Relative isolation therefore needs to be done deliberately when it cannot, or when the procedure does not call for a dam. For the dam side of the equation, see our rubber dam isolation guide.
Cotton rolls: how to choose the right size
Cotton rolls are the default for relative isolation. A roll placed beside the teeth soaks up saliva and keeps the area dry during fillings, sealants, bonding and hygiene work, and it helps hold the cheek or tongue away from the tooth.
Size is the main buying decision. Size #2 is commonly called medium; size #1 is thinner and size #3 is thicker, and exact dimensions vary a little between manufacturers. Medium (#2) is a common general-purpose size.
EBIKO Dental Cotton Rolls Size #2 measure 1½ in long and 3/8 in across (about 38 × 10 mm). A pack of 2,000 white rolls, packed in wrapped bundles, is C$18.99, just under one cent per roll (SKU EBK07001).
Storage matters as much as the roll itself. A loose bag of cotton rolls on the counter gets handled with gloved hands between patients. The EBIKO Cotton Roll Dispenser (C$19.99, in white or blue) has an enclosed design and dispenses a single roll at a time, which the product description says is meant to reduce contamination.
Pro Tip: Place the maxillary roll in the buccal vestibule opposite the parotid opening first, then the mandibular roll lingually. Change any roll as soon as it looks saturated; a soaked roll can no longer absorb.
Dry angles: when cotton rolls are not enough
When a buccal cotton roll keeps saturating near the parotid duct, dry angles are one option. They are triangular pads placed against the cheek to cover the duct opening.
EBIKO Dry Angle Saliva Absorbents come 50 pads to a box at C$20.00, in four versions:
- Small: described for paediatric patients and narrow arches
- Large: described for standard adult anatomy
- Reflective backing: a mirrored surface that, according to the product description, bounces operatory light back into the working area and shields the cheek from rotary instruments
- Original backing: a soft white, non-reflective back
According to the product page, the pads use a super-absorbent polymer that traps saliva as a gel for up to 15 minutes per pad. They are single-use and latex-free.
Pro Tip: Stock both sizes in every operatory so the pad can be matched to the patient's arch at the chair, rather than making do with whichever size happens to be in the drawer.
Gauze: 2×2 versus 4×4, woven versus non-woven
Gauze sponges are flat squares used for wiping, drying and applying pressure. Two decisions matter.
Size
A 2×2 in sponge is about 5 × 5 cm and covers most chairside wiping and drying. A 4×4 in sponge is about 10 × 10 cm, four times the area, and suits jobs that need a larger pad.
Woven or non-woven
Woven gauze is cotton thread woven into a grid. Non-woven gauze is fibres pressed or bonded together, so it has no threads to unravel, is usually softer and tends to shed fewer fibres. For most chairside use, non-woven is the common choice.
EBIKO Dental stocks both sizes in non-woven, 4-ply construction:
- Gauze 2×2, Non-Woven 4-Ply: 5,000 sponges (bags of 200) for C$24.99, about half a cent each. The material is listed as 50% viscose (rayon) and 50% polyester, and the bag is printed non-sterile.
- Gauze 4×4, Non-Woven 4-Ply: 2,000 single-use pads for C$36.99.
The 2×2 sponges are labelled non-sterile, so they suit general chairside use rather than procedures that call for sterile gauze. Pair them with a Gauze Dispenser (C$16.99, blue, white or yellow) to keep the open stack clean and organised on the counter.
Saliva ejectors and tongue guards
Absorbents hold moisture; suction removes it. A saliva ejector is a narrow, flexible tube on the dental unit's low-volume line that removes saliva and water pooling in the mouth, and it is often left in place throughout treatment. It is not a substitute for high-volume evacuation during handpiece or scaler work. For the HVE side, see our evacuation and suction supplies guide.
- EBIKO Dental Saliva Ejectors: 1,000 per box for C$36.99 (about 3.7 cents each), in blue tip on clear tube or white on white.
- EBIKO Dental Saliva Ejector Tongue Guard: 50 single-use silicone guards for C$34.99. The guard slides onto a saliva ejector, sits between the tongue and the tip, keeps the tongue off the suction and holds the ejector in place for hands-free low-volume suction. Ejectors are sold separately.
A tongue guard is most useful for solo-operator procedures such as sealants or hygiene work, where nobody is free to retract the tongue and hold suction at the same time.
A sample moisture-control setup by procedure
Standardising trays like this has a supply-side benefit too: once every operatory uses the same items, usage becomes predictable and reorder points become easy to set.
Pro Tip: Count how many cotton rolls, dry angles and 2×2s a typical day actually uses in one operatory for a week, then set a reorder point at roughly two weeks of that usage. Absorbents are cheap per unit, so running out is the expensive mistake, not overstocking.
Buying moisture-control supplies in Canada
Because these are high-volume, low-cost items, pack size drives value. A 2,000-roll pack of cotton rolls or a 5,000-sponge pack of 2×2 gauze costs under a cent per unit at the prices above (about 0.95¢ per roll and 0.5¢ per sponge). Check unit price rather than pack price when you compare suppliers.
EBIKO Dental ships from Ontario, with free shipping on orders of $99+ CAD in the GTA, $199+ CAD in the rest of Ontario and $299+ CAD in the rest of Canada (before tax; exclusions apply), plus a price match guarantee. Prices quoted in this guide were current at the time of writing; check each product page for the latest.
Shop cotton, gauze and moisture-control supplies at EBIKO Dental.
What does your practice's standard isolation setup look like for sealants and posterior composites? Tell us what works in your operatories.
Sources
- Miao C, Yang X, Wong MC, et al. Rubber dam isolation for restorative treatment in dental patients. Cochrane Database of Systematic Reviews, 2021. doi:10.1002/14651858.CD009858.pub3
- EBIKO Dental product pages linked above (pack sizes, materials and prices)
Frequently Asked Questions
Q: What size cotton rolls do dentists use most?
Size #2, often called medium, is a common general-purpose size. EBIKO Dental's size #2 rolls measure about 38 × 10 mm. Size #1 is thinner and size #3 thicker, and exact sizes vary between manufacturers.
Q: What is the difference between a dry angle and a cotton roll?
A cotton roll is a firm cylinder placed beside the teeth to absorb saliva and retract soft tissue. A dry angle is a triangular pad placed against the cheek over the parotid duct opening, which is one option when a buccal cotton roll keeps saturating.
Q: Are cotton rolls as good as a rubber dam for bonding?
The evidence is limited. A 2021 Cochrane review found low-certainty evidence that rubber dam may lead to a lower failure rate of direct restorations than cotton rolls after six months, with very uncertain evidence at other time points. Use rubber dam where practical and careful relative isolation where it is not.