Dr. James Belcher, December 10, 2025

Cleaning done right: Why 90% of people make a mistake

Almost everyone thinks they are brushing their teeth correctly – yet studies show that around 90% make at least one critical mistake. In this article, you will learn what really needs to be considered to optimally protect your oral health.

Putzen richtig gemacht: Warum 90 % der Menschen einen Fehler machen

What’s behind it?

Brushing your teeth sounds simple: toothbrush, toothpaste, off you go. But many people scrub too hard, use the wrong technique, or rinse everything out immediately after brushing. All of this reduces the effectiveness of brushing—and can even cause damage, such as gum recession or sensitive tooth necks..

Why is it relevant?

Your teeth are exposed to attacks by bacteria, sugar, and acids every day. If you brush incorrectly, plaque (biofilm) is not thoroughly removed, or you place unnecessary stress on your gums. In the long term, this can lead to cavities and periodontitis—diseases that not only affect your teeth but also your overall health (e.g., risk of cardiovascular disease).


Info box
Most people only brush for an average of 45 seconds—but at least 2 minutes are recommended to ensure all tooth surfaces are reached.

Scientific background

Biofilm—a thin layer of bacteria—re-forms within hours. If it is not removed correctly, deposits harden into tartar. At the same time, studies show that immediate rinsing after brushing removes the protective film of fluoride and active ingredients before they can take effect. This is why dentists advise: spit out, but do not rinse.

Practical tips for everyday life

  • ✓ Use a gentle technique – small, circular movements instead of harsh scrubbing (Kaneyasu et al., 2024).
  • ✓ Choose the right brush – soft bristles are better for teeth and gums (Ranzan et al., 2019).
  • ✓ Do not rinse immediately – this allows the active ingredients in your toothpaste to remain active for longer (Brookes et al., 2025).
  • ✓ Brush twice a day for 2 minutes – and clean between your teeth at least once a day (Chapple et al., 2015).

At a glance

ⓘ Most people rinse incorrectly after brushing.

ⓘ Incorrect brushing harms gums and teeth.

ⓘ Brushing gently & letting active ingredients work provides better protection.

Sources

  • Brookes Z, Bescos R, Witton R, et al. An Update on Mouthwashes: Advice for Dental Practitioners. British Dental Journal. 2025;239(5):312–315. doi:10.1038/s41415-025-9115-3.

  • Chapple IL, Van der Weijden F, Doerfer C, et al. Primary Prevention of Periodontitis: Managing Gingivitis. Journal of Clinical Periodontology. 2015;42 Suppl 16:S71–S76. doi:10.1111/jcpe.12366.

  • Kaneyasu Y, Shigeishi H, Niitani Y, et al. Manual Toothbrushes, Self-Toothbrushing, and Replacement Duration to Remove Dental Plaque and Improve Gingival Health: A Scoping Review From Recent Research. Journal of Dentistry. 2024;148:105240. doi:10.1016/j.jdent.2024.105240.

  • 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. International Dental Journal. 2019;69(3):171–182. doi:10.1111/idj.12421.

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