TePe Interdental Brush Sizes: Which One Do You Need?
By Oral Health Care &lnterdental Brush- | Published: 2026-09-05
Category: Buying Guides
Learn how to choose the right TePe interdental brush size with our practical guide. Understand ISO sizes, fit, and trade-offs for effective cleaning.
Quick Answer
To choose the right TePe interdental brush, start with the smallest size that fits snugly between your teeth without forcing. TePe uses color-coded ISO sizes from 0 to 9; common sizes for most people are ISO 1 (orange), 2 (red), and 3 (blue). If you're unsure, consult your dentist or try a mixed pack to find your fit.
Choosing the right TePe interdental brush size can feel confusing with so many color options. But getting the fit right matters: a brush that's too small won't clean effectively, while one that's too large can hurt your gums. This guide breaks down how to pick your size based on your gaps and comfort.
TePe brushes use a color-coded system that corresponds to ISO sizes, which indicate the brush's diameter. Understanding this system helps you identify the right brush quickly and reorder it easily. Here's what you need to know.
Understanding TePe ISO Sizes and Color Coding
TePe interdental brushes come in a range of sizes, each marked with a specific color and an ISO number. The ISO size refers to the diameter of the brush in millimeters. For example, TePe Original Yellow is ISO 4 (0.7 mm), while TePe Original Red is ISO 2 (0.5 mm). Smaller numbers mean thinner brushes for tighter gaps; larger numbers are for wider spaces.
The color coding is consistent across the TePe range, so once you know your size, you can easily pick the same color in different brush styles, like the angled TePe Angle or the extra-soft TePe Extra Soft. This system simplifies reordering and trying new brush types without guessing.
- TePe Original Yellow: ISO 4 (0.7 mm) – a common mid-size option.
- TePe Original Red: ISO 2 (0.5 mm) – for tighter gaps.
- TePe Original Green: ISO 5 (0.8 mm) – for slightly wider gaps.
How to Test the Fit: The 'Snug but Not Forced' Rule
The best way to find your size is to test the brush between your teeth. It should slide in with gentle resistance, but you should never have to force it. If the brush bends or you feel pain, it's too large. If it slides in without touching the sides of the gap, it's too small.
Start with a smaller size and move up until you feel a snug fit. This method prevents gum irritation and ensures the bristles make contact with the tooth surface to remove plaque effectively. When in doubt, choose the smaller size to avoid injury.
- Use a mirror and good lighting to see the brush insertion.
- If bleeding occurs, it may be normal at first, but stop if pain persists.
Choosing Between Original, Angle, and Extra Soft
TePe offers several brush styles, and your choice depends on your needs. The TePe Original has a straight head and short handle, ideal for general use. The TePe Angle features a long handle and angled head, making it easier to reach back teeth. TePe Extra Soft has gentler bristles for sensitive gums or after oral surgery.
All styles come in the same color-coded sizes, so you can switch based on comfort or access without changing size. For example, if you have tight spaces in the back, the TePe Angle might be easier to maneuver than the Original.
- TePe Angle Yellow (ISO 4) is a good choice for back teeth.
- TePe Extra Soft Orange (ISO 1) is for very sensitive gums.
Decision Rules for Choosing Your TePe Size
- Start with the smallest size that fits snugly: Test with a size that slides in with gentle resistance. If it falls out or moves without touching, go up a size. Checkpoint: The brush should stay in place when you release it.
- Consider your gap location: For back teeth, choose an angled brush like TePe Angle for better reach. For front teeth, a straight Original may suffice. Trade-off: Angle adds convenience but may be slightly less sturdy than Original's short handle.
- Match brush style to your gum sensitivity: If you have sensitive gums, dry mouth, or recent surgery, opt for Extra Soft bristles in your size. Trade-off: Extra Soft is gentler but may wear out faster than standard bristles.
Product Facts
- TePe® Interdental Brushes Original Yellow - Carton Pack: TePe Original Interdental Brushes are designed to clean the gaps between the teeth, where a regular toothbrush is unable to reach. Our best-selling brush for removing plaque between the teeth, featuring a straight brush head and short handle - available in 9 sizes. This is a versatile, all-around option for most users, and the yellow size (ISO 4) suits medium gaps.
- TePe® Interdental Brushes Extra Soft Orange - 0.45 mm (ISO 1): TePe Extra SoftTM Interdental Brushes are designed to clean the gaps between the teeth, where a regular toothbrush is unable to reach. This interdental brush has Extra Soft bristles for the most gentle clean – recommended for patients with sensitive teeth, dry mouth or after oral surgery – available in 6 sizes. If you have sensitive gums or are recovering from dental work, this brush offers a gentler clean while still fitting tight gaps.
Fit Guidance
Best For
- People with tight gaps who need a precise fit (ISO 1-2)
- Those with back teeth gaps who benefit from an angled head
Not For
- If you have very wide gaps, you may need larger sizes (ISO 6+) not covered in this guide.
- If you have braces or complex dental work, consult your dentist for specific size recommendations.
Finding the right TePe interdental brush size is about matching the brush to your gaps and comfort. Start small, test the fit, and don't hesitate to ask your dentist for guidance. With the correct size, you'll clean effectively and keep your gums healthy.

