Why TePe Original Black (1.5 mm) Is Ideal for Large Gaps
By Oral Health Care &lnterdental Brush- | Published: 2026-10-25
Category: Buying Guides
If you have wide interdental spaces, the TePe Original Black (1.5 mm / ISO 8) offers a precise fit and effective plaque removal. This guide explains when it works best and what to consider.
Quick answer
For consistently wide interdental gaps (roughly 1.5–1.8 mm), the TePe Original Black (1.5 mm / ISO 8) provides a snug, effective clean without forcing the brush into spaces that are too tight.
Why size matters for large gaps
Using a brush that is too small leaves plaque undisturbed in the center of the gap. A brush that is too large can damage the gum papillae or bend the wire. The TePe Original Black is designed for gaps that accept a 1.5 mm diameter brush, which corresponds to the larger end of the size range available.
Trade-off: not for tight contacts or posterior molars with narrow spaces
The 1.5 mm brush is too thick for most front-tooth contacts or for gaps that measure under 1.2 mm. If you have a mix of tight and wide spaces, you will need a smaller size (e.g., TePe Original Pink 0.7 mm or Orange 0.8 mm) for the narrower gaps and the Black for the wider ones.
How to decide if the TePe Original Black (1.5 mm) is right for you
- Check the gap size first: Gently insert the brush at a 90-degree angle. If it slides in with slight resistance and the wire does not bend, the size is correct. If it enters too easily or leaves visible space around the bristles, the gap is larger and you may need the TePe Original Violet (1.8 mm).
- Use daily for plaque control: The TePe Original Black is designed for daily use. Move the brush back and forth 2–3 times per gap. Rinse the brush after each gap and replace it when the bristles wear or bend. Replace the brush every 1–2 weeks or sooner if bristles are frayed.
- Combine with smaller sizes if gaps vary: If you have a mix of narrow and wide spaces, buy a multi-pack or individual sizes. The Black works only for the larger gaps; using it on tight spaces can cause gum irritation. Keep a set of 2–3 sizes so you can match each gap correctly.
Product facts
- TePe® Interdental Brushes Original Black - 1.5 mm (ISO 8): TePe Original Interdental Brushes are designed to clean the gaps between the teeth, where a regular toothbrush is unable to reach. This best-selling brush features a straight brush head and short handle and is available in 9 color-coded sizes. The straight head and short handle give you good control when reaching back molars, and the 1.5 mm diameter (ISO 8) matches the larger size category for consistent wide-gap cleaning.
TePe® Interdental Brushes Original Black - 1.5 mm (ISO 8)
Who should (and should not) choose the TePe Original Black 1.5 mm
Best for
- People with consistently wide interdental gaps (1.5–1.8 mm) who want a single-size brush for their entire mouth
- Users who have tried a smaller size (e.g., 1.3 mm) and found it too loose or ineffective
Not ideal for
- Anyone with mostly tight contacts or gaps under 1.2 mm – consider TePe Original Pink (0.7 mm) or Orange (0.8 mm) instead
- Users who need a bent or angled handle for hard-to-reach posterior spaces – the TePe Angle range may be a better fit
