Brushing harder feels like cleaning better. But do firmer bristles actually do your gums any favours? A 2019 systematic review of 13 controlled studies took a closer look at bristle stiffness and soft-tissue effects.
Study at a glance
- Type: systematic review of controlled studies
- Authors / journal: Ranzan N, Muniz FWMG, Rösing CK. International Dental Journal, 2019
- Question: are bristle stiffness and bristle end-shape related to adverse effects on oral soft tissues during toothbrushing?
- Evidence base: 13 studies, selected from 1,945 records initially retrieved
What the research shows
The authors searched several databases plus grey literature for controlled trials comparing manual toothbrushes with different bristle stiffness and/or end-shape. Thirteen studies met their criteria.
The main finding: hard-bristle toothbrushes produced more gingival (gum) lesions than medium- and soft-bristle brushes. The authors concluded that soft and extra-soft toothbrushes tend to be safer for the soft tissues of the mouth. For bristle end-shape, they identified only a slight increase in gingival recession width in the end-rounded group compared with the tapered group, so shape appeared to matter far less than stiffness.
Honest caveats: only four of the included studies measured adverse effects as their primary outcome, and the authors recommended more research designed around that question. Separate individual trials comparing medium and soft brushes have reported that medium brushes can remove somewhat more plaque but also cause more gum abrasion near the gumline, so the picture is a trade-off rather than a simple win for either side.
Why it may work
Gum tissue is delicate. Stiffer filaments exert more force on the margin where tooth meets gum, and combined with a vigorous scrubbing motion that may irritate or abrade the tissue over time. Softer, finer filaments flex more and may reach along the gumline with less pressure. Plaque is a soft biofilm, so it generally does not need force to be disturbed; careful technique and thoroughness probably matter more than stiffness.
Real-world use
Most people brush for the feeling of "squeaky clean" and press harder when in a hurry. If you notice sensitivity, redness or a sore feeling at the gumline, that is a reason to review your brush and technique, and to mention it at your next dental check-up. A soft brush used patiently, twice a day, is a sensible default for many adults.
Where Gudslip fits in
The Gudslip® toothbrush collection is built around choosing bristle softness to suit you, with a range from medium-soft to ultra-soft. For example, the Earth super-soft toothbrush uses 6,000 super-soft filaments, and the Moon ultra-soft toothbrush uses 12,500 ultra-soft filaments for very sensitive teeth and gums. You can browse the full range in the toothbrushes collection. We share the review's findings as context for choosing softer bristles; we do not claim that any toothbrush treats or prevents gum disease or recession.
How to use it
- Hold the brush like a pen, not a fist, to keep pressure light.
- Angle the bristles gently toward the gumline and use small, short strokes rather than long scrubbing sweeps.
- Brush for about two minutes, twice a day, covering every surface.
- Replace the brush roughly every three months, or sooner if the filaments look splayed.
Frequently asked questions
Are soft toothbrushes less effective at cleaning?
Some individual trials found medium brushes removed somewhat more plaque, but with more gum abrasion. Thorough technique and consistency matter a lot, so many people do well with soft bristles.
Does the shape of the bristle tips matter?
In this review, the difference linked to end-shape was slight compared with the effect of stiffness.
Should I switch to an ultra-soft brush if my gums are sensitive?
It may be worth trying, and a dental professional can advise you on the right brush and technique for your situation.
Does this review prove soft brushes protect against gum recession?
No. It looked at adverse effects such as gum lesions across a limited set of studies and recommended further research.
The bottom line
Based on 13 controlled studies, harder bristles were linked to more gum lesions than medium or soft ones, and soft brushes tend to be the safer choice. Pair a soft brush with a light touch and good technique.
Disclaimer: This article is for general wellness information only and is not medical or dental advice. Gudslip® products are not intended to diagnose, treat, cure or prevent any disease. Consult a healthcare or dental professional about gum or tooth concerns.
References
- Ranzan N, Muniz FWMG, Rösing CK. Are bristle stiffness and bristle end-shape related to adverse effects on soft tissues during toothbrushing? A systematic review. Int Dent J. 2019;69(3):171-182. Link