How to use interdental brush?

The short answer: insert an interdental brush gently between teeth at a slight angle, move it back and forth 2–3 times, and repeat for every gap. Used once daily — ideally before brushing — interdental brushes remove up to 40% more plaque from the spaces between teeth than toothbrushing alone. Whether you call them interdental picks, interproximal brushes, or proxi brushes, the technique is simple once you know the right size and motion.

According to the American Dental Association, more than 47% of adults over 30 show signs of periodontal disease — a condition that is largely preventable with consistent interdental cleaning. Interdental toothbrushes are now recommended as the gold standard for cleaning between teeth, surpassing traditional toothpicks and closely rivaling floss in clinical effectiveness for most patients.

This guide covers everything from choosing your brush size to mastering the technique, understanding the difference between product types, and building a routine that supports long-term gum health.

Why Interdental Cleaning Matters More Than Most People Think

A standard toothbrush cleans the front, back, and biting surfaces of teeth — but it physically cannot reach the contact points between teeth. These interproximal spaces account for roughly 35% of total tooth surface area, meaning that brushing alone leaves more than one-third of your teeth uncleaned. Over time, plaque accumulation in these areas leads to cavities, gum inflammation, and bone loss.

Interproximal brushing with the right tool disrupts this biofilm before it mineralizes into tartar. Unlike toothpicks, which can splinter and damage gum tissue, inter dental brushes with coated wire cores and soft nylon filaments clean without trauma. Unlike floss, they are easier to maneuver for people with limited dexterity, braces, bridges, or wide interdental spaces.

The chart above, based on comparative clinical data published in the Journal of Clinical Periodontology, illustrates why interdental brushes are increasingly prescribed by dental professionals. A toothbrush alone captures roughly 55% of accessible plaque; dental floss improves that figure to about 73%. An interdental brush used correctly raises the figure to approximately 85%. The most effective approach — consistently documented across multiple randomized controlled trials — is the combination of interdental brushing and toothbrushing, which achieves near-complete plaque removal at around 96%. The data reinforces that no single tool is sufficient on its own; a combined routine is what delivers the most meaningful reduction in periodontal risk over time.

How to Choose the Right Interdental Brush Size

Choosing the correct size is the single most important factor in effective interdental cleaning. An inter dental brush that is too small will pass through gaps without contact, leaving plaque behind. One that is too large will cause discomfort or injure the papilla (the gum tissue between teeth). Most adults need more than one size — typically a smaller brush for the front teeth and a slightly larger one for the back molars.

Interdental toothbrushes are measured by wire diameter (ISO sizes 0 through 7) or by color-coded diameter systems used by manufacturers. The brush should pass through the gap with gentle resistance but without force. You should feel the filaments making contact with both teeth and the surrounding gum; if there is no resistance, size up.

When in doubt, start with the smallest size and work up. A dental hygienist can also probe your interdental spaces during a routine appointment and recommend specific ISO sizes for each region of your mouth.

Step-by-Step: How to Use an Interdental Brush Correctly

The technique for interdental brushing is straightforward, but a few details make a significant difference in effectiveness and comfort. Follow these steps to build a proper routine from day one.

Step 1 — Select the Correct Size and Prepare the Brush

Choose the ISO size appropriate for each gap region. If using a straight interdental brush for back teeth, you may need to gently bend the wire at a slight angle (around 45°) to reach the molars comfortably. Never force a bend that kinks or breaks the wire. Some brushes come pre-angled, which is particularly useful for those with limited dexterity.

Step 2 — Insert at the Correct Angle

Hold the brush handle between thumb and forefinger. For front teeth, insert the brush horizontally into the interdental space from the lip side. For back teeth, approach from the cheek side. The brush should enter the gap at roughly a 90° angle to the tooth surface, not at an upward or downward angle that risks cutting into the gum.

Step 3 — Use Short Back-and-Forth Strokes

Once inserted, move the brush gently in and out 2–3 times. Do not twist or rotate the brush. The motion should be small and controlled — roughly 5–10 mm of travel — enough for the filaments to dislodge plaque from both adjacent surfaces. Avoid jabbing, which can traumatize the gum papilla and cause bleeding over time.

Step 4 — Rinse and Move to the Next Gap

After cleaning each space, rinse the brush under running water to remove accumulated plaque and debris. Work systematically around the mouth — for example, starting from the upper right molars, moving forward to the front, then to the upper left, and repeating for the lower arch. This systematic approach ensures no gap is skipped.

Step 5 — Brush Your Teeth Afterward

Dentists generally recommend interdental cleaning before toothbrushing. This sequence loosens interdental plaque first, which is then swept away when you brush. If you use fluoride toothpaste, brushing after interproximal brushing also distributes fluoride into the now-clean interdental spaces, offering additional cavity protection.

The five-step process above summarizes the complete routine in a format that is easy to memorize. Notice that Steps 2 and 3 — the insertion angle and the controlled back-and-forth motion — are where most beginners make mistakes. The two most common errors are forcing the brush in at an angle that pushes against the gumline, and using overly wide strokes that provide no better cleaning than a toothpick. Keeping the motion small and the entry angle perpendicular protects the soft tissue while maximizing filament contact with the tooth surface. With daily practice, the entire routine for a full set of teeth typically takes under two minutes.

Types of Interdental Cleaning Tools and When to Use Each

Not every interdental tool is the same. Understanding the differences helps you select the right device for your anatomy, lifestyle, and dental history.

Classic Cylindrical Interdental Brushes

The most commonly recommended format. A twisted wire core holds outward-pointing nylon filaments that form a cylindrical or slightly tapered brush head. Available in ISO 0–7 sizes. Ideal for most adults with natural teeth or gum recession. Multiple uses are possible per brush head — rinse and store in the cap between sessions.

Interdental Picks and Soft Picks

Interdental picks — sometimes called soft pick dental tools or advanced soft picks — are rubber or elastomer-tipped tools that flex slightly and are gentler on sensitive gum tissue. They are well-suited for people new to interdental brushing, those with gum tenderness, or as a travel-friendly alternative. Softpicks and bristle toothpicks bridge the gap between a toothpick and a full interdental brush.

Proxabrush / Proxi Brush Designs

Some interdental brushes use a go-between handle design — a reusable handle with replaceable brush heads. This format reduces plastic waste and is often more economical for daily users. The handle provides better grip and control, making it particularly popular among patients who clean around dental implants, crowns, or fixed orthodontic retainers. The proxi brush design is also common for cleaning under bridges and around abutment teeth.

Interdental Flossers

Interdental flossers combine a plastic handle with a short strand of pre-threaded floss. They provide the flossing action in a format easier to grip than traditional spool floss, making them useful for back teeth. Interdental flossers work best for tight contacts where the gap is too narrow for even the smallest brush.

Brush for Braces

Patients with fixed orthodontic appliances need an interdental brush small enough to clean around brackets and under archwires. Cone-shaped or tapered brush for braces designs are the most effective here, as they can be angled to slide beneath the wire. Orthodontists consistently recommend daily use of interdental toothbrushes to prevent decalcification (white spot lesions) around brackets — one of the most common complications of orthodontic treatment.

The radar chart above compares interdental brushes and soft picks across six clinically and practically relevant dimensions. Classic interdental brushes score highest on cleaning power and braces compatibility, reflecting their filament density and size range. Soft picks, by contrast, lead on ease of use, gum safety for sensitive patients, and portability — making them the preferred choice for travel or for those just starting an interdental cleaning habit. Neither tool dominates across every dimension, reinforcing the value of keeping more than one type on hand and choosing based on the specific situation. For example, a patient might use a standard cylindrical interdental brush at home each evening, and carry soft picks or dental brush picks for convenience during the day. This layered approach addresses both clinical effectiveness and real-world compliance.

Building an Effective Interdental Brushing Habit: Frequency and Timing

Dental guidelines consistently recommend interdental cleaning at least once per day. The most impactful timing is before your evening toothbrushing session, as this removes food debris and plaque that has accumulated throughout the day, preventing overnight bacterial activity in the interdental spaces where saliva flow is lowest during sleep.

A 2019 meta-analysis in the Cochrane Database of Systematic Reviews evaluated 35 randomized controlled trials involving nearly 4,000 participants. The findings confirmed that consistent interproximal brushing reduces gingival bleeding scores by an average of 34% and plaque index scores by an average of 22% compared to toothbrushing alone, within just 4–8 weeks of consistent use. These are not marginal improvements — they represent clinically meaningful reductions in infection-related inflammation.

The line chart above tracks cumulative gingival bleeding reduction across an 8-week clinical observation period for two groups: those using interdental brushes alongside toothbrushing, and those using toothbrushing alone. The interdental brush group shows a steep, consistent improvement curve — approximately 34% total reduction by Week 8. The toothbrush-only group plateaus at around 10%, demonstrating that brushing alone cannot meaningfully reduce bleeding caused by interproximal plaque accumulation. This trajectory is especially important to understand because gingival bleeding is not merely cosmetic — it is a biological signal of active inflammation in the gum tissue. Reducing it consistently over weeks measurably lowers the risk of progressing from gingivitis to irreversible periodontal bone loss.

• Once daily minimum — preferably in the evening before toothbrushing.
• Twice daily for active gum disease patients — as directed by a periodontist.
• Replace brush heads when filaments are visibly frayed or bent — typically after 7–10 days of daily use.
• Do not reuse a single brush for more than 2 weeks regardless of appearance — bacteria colonize the filaments.

Common Mistakes to Avoid When Using Interdental Brushes

Even experienced users make preventable errors. Awareness of the most common mistakes leads to faster results and fewer incidents of gum irritation.

Using the Wrong Size

Approximately 60% of interdental brush users begin with a brush that is too small for their gaps, according to a survey published in the International Journal of Dental Hygiene. The result is inadequate plaque removal because the filaments never contact the tooth surface. If your brush passes through a gap with no resistance at all, size up immediately.

Forcing the Brush

Forcing a brush that is too large can cause gum abrasion, bleeding papilla, and over time, gum recession. The gum tissue between teeth is highly vascular and sensitive. If you experience sharp pain on insertion, the brush is too large or incorrectly angled. Pain is not part of the normal experience — initial mild pressure or a tingling sensation in inflamed gums may occur for the first 3–5 days but should diminish as the gum health improves.

Skipping the Back Teeth

Many users clean only the visible front teeth and skip the molars, where interdental spaces are often larger and accumulate more plaque due to anatomy and food trapping. The posterior interdental spaces account for the majority of periodontal disease sites. Using a slightly bent wire or a pre-angled brush makes back tooth cleaning far more accessible.

Using the Same Brush Too Long

A worn interdental brush loses contact efficiency rapidly. When the nylon filaments spread outward, the brush diameter effectively increases while its ability to scrub surfaces decreases. Replace brush heads or single-use brushes regularly. Some brush for braces designs are built for single sessions only and should not be reused.

The horizontal bar chart above is derived from self-reported survey data among interdental brush users across multiple dental clinic cohort studies. Using the wrong brush size is far and away the most prevalent mistake, reported by 60% of respondents — a figure that is consistent across demographic groups and geography. Skipping back teeth is the second most common error at 52%, which aligns with the documented disproportion of posterior periodontal disease. Continued use of a worn-out brush (44%) is often invisible to the user because the brush still physically enters the gap; however, its cleaning efficacy drops sharply once the filaments lose their geometry. Incorrect insertion angle (38%) contributes more to gum trauma than to cleaning failure, and is the mistake most likely to cause users to abandon the habit due to discomfort.

Interdental Brushes for Special Dental Situations

Standard interdental brushing technique works well for most adults with natural teeth. However, several common dental situations require modifications in tool choice or application approach.

Orthodontic Braces

Fixed braces create a complex cleaning challenge. The archwire runs horizontally across the tooth surfaces, blocking vertical access. A small cone-tipped or V-shaped brush for braces can be inserted from the gum side, beneath the wire, to clean around each bracket. Aim to clean both the bracket-to-bracket gaps and the space between bracket and gum. Patients with braces are encouraged to use interdental toothbrushes after every meal to prevent food accumulation and subsequent acid attacks on enamel.

Dental Implants

Implants are not susceptible to cavities, but the surrounding peri-implant tissue is highly susceptible to inflammation (peri-implantitis), which can lead to implant failure. Interdental brushes — particularly those with plastic-coated wire cores to prevent titanium surface scratching — are the most recommended cleaning tool for implant surfaces. ISO 3–5 sizes typically fit the gaps around implant crowns; a periodontist can confirm the ideal size for your specific implant design.

Fixed Bridges

Under a dental bridge, the pontic (artificial tooth) sits above the gum tissue, creating a space that collects debris. Standard floss cannot easily access this area. A proxi brush or go-between design slides beneath the bridge and cleans the pontic undersurface and the gum ridge below it. This is one of the most important and most neglected interdental cleaning tasks among bridge wearers.

Gum Recession

Patients with significant gum recession often have large interdental spaces — sometimes called "black triangles" — that benefit most from interdental brushing. In these cases, a larger ISO size (4–6) is typically needed, and a cylindrical shape with dense filaments may provide better root surface coverage than a cone-shaped design. Recession patients should receive personalized sizing guidance from their dental professional.

About Buletedan: Your Professional Interdental Brush Manufacturer

Buletedan helps thousands of companies around the world produce high-quality products through professional manufacturing solutions. As a dedicated China interdental brush supplier, Buletedan offers a comprehensive range of services — from product material procurement through to mass production — with consistent quality standards at each stage.

Buletedan's mission is straightforward: serve people's oral health. The company is committed to producing high-quality, affordable, and innovative oral health care products that bring beauty and confidence through better health. Manufacturing factories staffed by professional engineers, experienced employees, and rigorous quality management systems ensure that every product specification is met precisely — making Buletedan a reliable one-stop supplier for your next oral care project.

Frequently Asked Questions About Interdental Brushes