TePe Interdental Brush Sizes: How to Choose the Right Fit for Your Teeth
By Oral Health Care &lnterdental Brush- | Published: 2026-08-02
Category: Buying Guides
Learn how to choose the right TePe interdental brush size for your teeth. Understand ISO sizes, color coding, and fit testing with this comprehensive guide.
Choosing the right interdental brush size is essential for effective cleaning and gum health. With TePe's range of color-coded brushes, finding your perfect fit can be simple—if you know what to look for. This guide will walk you through the sizing system, how to test for the correct fit, and tips for selecting the right brush for different spaces in your mouth.
TePe interdental brushes come in a variety of sizes, each color-coded according to the ISO standard. Understanding these sizes helps you clean effectively without causing damage to your gums or teeth. Whether you have tight gaps or wider spaces, there's a TePe brush designed for you.
Understanding TePe Interdental Brush Sizes and ISO Standards
TePe interdental brushes follow the ISO 16409 standard, which defines the diameter of the brush in millimeters. Each color corresponds to a specific size range, making it easy to identify the brush you need. For example, the TePe® Interdental Brushes Extra Soft Yellow - 0.7 mm (ISO 4) is designed for very tight spaces, while larger sizes like the orange (ISO 6) are for wider gaps.

The color coding system is consistent across TePe products, so once you know your size, you can easily reorder or try different brush types. The ISO size indicates the diameter of the wire core and bristles, which determines how well the brush fits between your teeth. Using the correct size ensures you remove plaque effectively without forcing the brush or causing gum irritation.
- Yellow (ISO 4): 0.7 mm – for very tight spaces
- Orange (ISO 6): 1.1 mm – for moderate gaps
- Red (ISO 7): 1.3 mm – for larger spaces
How to Determine Your Interdental Brush Size
The best way to find your size is to test different brushes. Start with the smallest size that you can gently insert between your teeth. The brush should fit snugly but not force its way through. If the bristles bend or you feel resistance, try a smaller size. If the brush slides in too easily and doesn't touch the sides, go up a size.
Your dentist or dental hygienist can also help you determine the right sizes for your mouth. They may use a special probe to measure the gaps between your teeth. Keep in mind that you may need multiple sizes for different areas of your mouth, as the spaces between molars are often larger than those between front teeth.
- Test with a mirror and good lighting to see the brush placement
- Gently insert the brush at a 90-degree angle to the tooth surface
- If the brush bends or splays, it's too small; if it feels tight, it's too large
TePe Interdental Brush Size Chart and Color Guide
TePe offers a comprehensive range of sizes, each with a distinct color. Here's a quick reference chart to help you understand the options:
The TePe® Interdental Brushes Original Orange - Carton Pack is a popular choice for those with moderate spaces, offering a comfortable fit and effective cleaning. For very tight spaces, the Extra Soft Yellow is ideal. Remember that the actual size you need depends on your specific gaps, so always test before committing.

- Yellow (ISO 4): 0.7 mm – Extra Soft, for tight spaces
- Orange (ISO 6): 1.1 mm – Original, for moderate gaps
- Red (ISO 7): 1.3 mm – for larger spaces
- Pink (ISO 8): 1.5 mm – for wide gaps
- Violet (ISO 9): 1.8 mm – for very wide gaps
Choosing the Right TePe Brush for Different Tooth Gaps
Not all gaps are the same, so you may need multiple sizes. For the tight spaces between your front teeth, a smaller size like the TePe Interdental Brush TePe Angle™ might be easier to handle. The angled design helps you reach back molars with ease. For wider gaps, consider the TePe® Interdental Brushes Original Orange - Carton Pack for a comfortable and thorough clean.
If you have implants or orthodontic appliances, you might need special brushes. TePe Special Care™ is designed for sensitive gums and implants, offering a gentle yet effective clean. For those who prefer a more sustainable option, TePe offers brushes with replaceable heads, like the TePe ChoiceTM Toothbrush - (with 3 Replaceable Brush Heads), which reduces plastic waste.
- Use smaller sizes for tight spaces and larger sizes for wider gaps
- Consider angled brushes for easier access to back teeth
- For sensitive gums, choose extra soft or special care options
Common Mistakes When Choosing Interdental Brush Sizes
One common mistake is choosing a brush that is too large, which can cause gum irritation and bleeding. Another is using a brush that is too small, which won't effectively remove plaque. It's also important to replace your brush regularly, as bristles wear out and become less effective.
Many people assume that one size fits all, but your mouth has a variety of gaps. Take the time to test different sizes and consult with your dentist if you're unsure. Using the correct size not only improves cleaning but also prevents damage to your gums and tooth enamel.
- Don't force a brush into a space that is too small
- Replace brushes when bristles become bent or worn
- Use a mirror to ensure you're cleaning at the right angle
Choosing the right TePe interdental brush size is crucial for maintaining healthy gums and teeth. By understanding the ISO color coding and testing different sizes, you can find the perfect fit for your unique needs. Start with a size guide and experiment to see what works best for you. For a great starting point, check out the TePe® Interdental Brushes Extra Soft Yellow - 0.7 mm (ISO 4) for tight spaces or the TePe® Interdental Brushes Original Orange - Carton Pack for moderate gaps. Your smile will thank you!



