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Prevention & Restorative

Bleeding gums: harmless or a warning sign? Causes & what helps.

Blood on the toothbrush? That is a signal you should not ignore. We explain the causes — and what helps.

Dr. Nazanin Böhle · HOS Editorial
6 min read30 June 2026

Why do gums bleed?

The most common cause is gum inflammation (gingivitis): if plaque builds up at the gum line, the tissue reacts with inflammation — it becomes red, swells and bleeds easily, for example when brushing. Less often, hormonal changes, medication or a toothbrush that is too hard are behind it.

Harmless or serious?

Gingivitis (reversible)

Pure gum inflammation is <strong>reversible</strong>: with good oral hygiene and a professional cleaning, the gums usually calm down within days to weeks.

Periodontitis (permanent)

If the inflammation remains untreated, it can spread to the <strong>tooth-supporting structures</strong>. This bone loss is no longer reversible — untreated, loose teeth and tooth loss can result.

Take these warning signs seriously

  • Gums bleed regularly when brushing or eating
  • Receding gums — the teeth look 'longer'
  • Persistent bad breath or a bad taste
  • Loose teeth or a changed bite

What helps?

With pure gingivitis, thorough oral hygiene and a professional cleaning are often enough. If periodontitis has already developed, we treat it specifically — gently and tissue-sparing also with the laser, which barely bleeds and supports healing. The earlier, the better the prognosis.

Cost

Periodontitis treatmentfrom CHF 160
Professional teeth cleaningCHF 190

Do your gums bleed again and again? Don't wait. You can find more about the periodontitis treatment with laser on the treatment page — or arrange a consultation at our practice at Löwenplatz in Zurich.

This article is for general information only and does not replace individual dental advice. Whether and which treatment is right for you is something we determine in a personal consultation based on your individual situation.

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