Dr. James Belcher, November 20, 2025

Mouthwashes under scrutiny: When they really make sense

Many people automatically reach for mouthwash after brushing their teeth – but does it actually do anything? Or does it even wash away important protective substances? In this article, you'll learn when mouthwash can make a difference. 

Mundspülungen im Check: Wann sie wirklich Sinn machen

What's behind it?

Mouthwashes come in many varieties – from fresh Mint solutions ...even including medical formulations. They are intended to fight bacteria , freshen breath , and sometimes even strengthen tooth enamel . But timing is crucial : Immediately after brushing your teeth, the fluoride in the toothpaste is often rinsed away – and it is actually meant to stay on the teeth for a long time.  

Why is it relevant?

Fluoride forms a protective film over the teeth after brushing, strengthening the enamel. If you use mouthwash immediately afterwards, this protection is washed away . Between meals, however, a mild rinse can help neutralize acids, loosen food residue and keep the microbiome in balance – especially if you can't brush your teeth immediately.


Infobox
Rinsing immediately after brushing your teeth can halve the cavity protection of your toothpaste – it's better to wait 30 minutes . 

Scientific background

Studies show that those who rinse their teeth with a fluoride-free rinse immediately after brushing lose up to 30% of the fluoride effect . From a bacteriological perspective, the ingredients in the rinse are crucial: Aggressive ingredients like chlorhexidine kill all bacteria – including the beneficial ones. Milderly formulated rinses or products with a microbiome-friendly approach , on the other hand, help to block only the harmful germs and protect the beneficial ones .  

Practical tips for everyday life

  • ✓ Do not rinse after brushing your teeth. Just spit out so that the fluoride stays on the teeth (Brookes et al., 2025) .
  • ✓ You can use mouthwashes between meals – especially after snacks, coffee or wine (Wikén Albertsson et al., 2010).
  • ✓ Choose rinses without harsh chemicals – prefer microbiome -friendly products (Koromantzos et al., 2025) . 
  • ✓ Rinsing does not replace brushing your teeth – it complements it. 

At a glance

ⓘ It's best not to rinse after cleaning .

ⓘ Rinsing between meals can be useful.

ⓘ Fluoride protection only remains if rinsing is not required .

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.

  • Koromantzos PA, Bobetsis YA, Giota C, et al. Effect of Adjunctive Use of Commercial Daily Mouthwashes on Periodontal Health: An Umbrella Review. Journal of Clinical Periodontology . 2025;. doi:10.1111/jcpe.70061.

  • Tartaglia GM, Kumar S, Fornari CD, Corti E, Connelly ST. Mouthwashes in the 21 Century: A Narrative Review About Active Molecules and Effectiveness on the Periodontal Outcomes. Expert Opinion on Drug Delivery . 2017;14(8):973–982. doi:10.1080/17425247.2017.1260118.

  • Wikén Albertsson K, Persson A, Lingström P, van Dijken JW. Effects of Mouthrinses Containing Essential Oils and Alcohol-Free Chlorhexidine on Human Plaque Acidogenicity. Clinical Oral Investigations . 2010;14(1):107–112. doi:10.1007/s00784-009-0273-5.

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