The short answer
Fixed dental work (festsitzender Zahnersatz) cannot decay. The natural tooth carrying it can, and that is what usually ends the life of a crown or a bridge. Two places do almost all the damage: the fine line where the crown meets the tooth (Kronenrand) and the gap under a bridge pontic (Brückenglied), where ordinary floss simply cannot go. A workable routine is brushing twice a day with attention to the gum line, one pass a day with interdental brushes (Interdentalbürsten) sized to your gaps, and one pass a day with superfloss or a floss threader under every bridge. On top of that, keep your professional cleaning appointments — in Germany they also earn the stamp in your bonus booklet (Bonusheft), which changes what your insurer pays if the work ever has to be replaced.
Why fixed dental work needs a different routine, not just more brushing
Most people leave the practice with a new crown and assume the job is done. Ceramic does not get holes in it, after all. That instinct is half right, and the half that is wrong is expensive.
A crown is a cap over a real tooth. Underneath the zirconia or the metal-ceramic there is still dentine, still a root, often still a living pulp. The crown protects the top and the sides — not the ring of tooth surface at or just below the gum line, which is exactly where a toothbrush tends to skate past.
A bridge adds a second problem. A three-unit bridge (Brücke) is two crowns on the neighbouring teeth with a replacement tooth suspended between them. That middle unit rests on the gum without being anchored in it, leaving a shallow space underneath that nothing biological cleans. Plaque sits there undisturbed unless you actively pull something through.
And an implant crown behaves differently again. A natural tooth sits in bone on a ligament with its own blood supply; an implant (Implantat) is fused directly to bone, and the soft-tissue seal around it is thinner and less forgiving. German dental societies keep making the same point: implants are not maintenance-free, they are maintenance-dependent.
The failure pattern in one sentence
In practice, crowns and bridges rarely break. They come out because caries starts at the margin, or because the gum recedes and inflames, or because the tooth underneath fractures after years of an unnoticed problem. Almost all of that is a hygiene story, not a materials story.
Your daily routine, step by step
You do not need a bathroom cabinet full of gadgets. You need three passes, done properly, in a fixed order so you stop thinking about it.
1. Brush the gum line, not the chewing surface. Angle the bristles about 45 degrees into the groove between tooth and gum and work in short movements, tooth by tooth. If you use an electric brush, hold it against each surface for a few seconds and let it do the work — pressing hard is the single most common mistake and, over years, it wears both the gum and the polished neck of the restoration. Soft to medium bristles are enough.
2. Interdental brushes through every gap. These small wire brushes (Interdentalbürsten, sold in every German Drogerie under names like TePe or Curaprox) matter more than string floss once you have crowns, because they clean the sides of the restoration where it disappears under the gum. Size is everything: a brush that slides in with no resistance is doing nothing. Your dental hygienist can measure your gaps at the next appointment and tell you the sizes — it is common to need two or three different ones for different parts of the mouth.
3. Superfloss or a threader under every bridge. Superfloss has a stiff plastic tip, a spongy middle and a length of normal floss. Thread the stiff end into the space beneath the pontic from the cheek side, pull the spongy part through, work it back and forth a few times and out the other side. Fifteen seconds per bridge, once you have the knack.
A water flosser (Munddusche) is a good supplement and a poor substitute. It flushes loose debris out from under a bridge and around implant crowns, and many patients with limited dexterity get real benefit from it. What it does not do reliably is disrupt the sticky biofilm that clings to the margin. Use it after the mechanical cleaning, not instead of it.
What helps, what harms
| Tool or habit | What it actually does | Worth knowing |
|---|---|---|
| Interdental brushes | Cleans the sides of crowns and the spaces around implant crowns | Correct size matters more than brand; ask us to size them |
| Superfloss / threader | The only realistic way under a bridge pontic | Once a day is enough; skipping it is the classic cause of bridge odour |
| Water flosser | Flushes debris, reduces bleeding for many people | Supplement, not replacement |
| Electric toothbrush | Consistent movement, pressure sensor helps | Do not scrub; let it rest against each tooth |
| Whitening toothpaste | Removes surface stain from enamel | Ceramic does not lighten; abrasive pastes dull the glaze over time |
| Chlorhexidine mouthwash | Short-term control of inflammation | Not a long-term product — it stains and alters taste; use as advised |
| Metal picks, fingernails, hard toothpicks | Nothing good | Can chip the ceramic edge or lever at the margin |
One point on aesthetics that surprises people: whitening does not work on fixed dental work. Bleaching lightens natural enamel. Ceramic and composite stay exactly the colour they were made. If you are considering whitening and you already have a visible crown, the sensible order is to bleach first, wait for the shade to settle, and only then have the visible restoration made to match. Doing it the other way round means the crown ends up darker than everything around it.
Implant crowns: same routine, gentler hands
If your fixed work sits on implants, keep everything above and add three things.
Clean right down to the soft tissue collar. The transition from crown to implant abutment sits at or slightly below the gum. That is the zone where peri-implant inflammation starts, and it responds well to a properly sized interdental brush used daily.
Watch for bleeding, and take it seriously. Around a natural tooth, gum that bleeds a little when you clean is a sign to clean better. Around an implant it is a sign to be examined, because bleeding is the earliest signal of peri-implant mucositis — the reversible stage before bone is lost.
Tell any new hygienist that you have implants. Instruments and polishing powders are chosen differently around implant surfaces than around enamel. In the practice that placed the implant this is automatic; if you move within NRW — to Düsseldorf, Cologne or Bonn — say it at the first appointment.
Temporary crowns are not the same thing
A temporary (Provisorium) is fixed with a deliberately weak cement so it can be removed again. Clean it — plaque under a temporary inflames the gum within days and can make the final fit worse — but pull floss out sideways rather than snapping it up and down, and stay off very sticky and very hard food on that side. Care of temporaries has its own logic, and we cover it separately.
The German recall system: PZR, Bonusheft and why it pays twice
Two appointments a year sound like a lot to someone who grew up with the NHS or with US insurance that covers “two cleanings”. In Germany the mechanics are different and worth understanding.
The check-up. Statutory health insurance (gesetzliche Krankenversicherung, GKV) covers a dental examination for adults; that is the appointment where your restorations get probed at the margin, where an X-ray may be taken if something looks suspicious, and where a loosening crown gets caught before the tooth under it is lost.
Professional cleaning (professionelle Zahnreinigung, PZR) is a separate service, usually not fully covered by the statutory fund, though many funds pay a subsidy and most supplementary dental policies (Zahnzusatzversicherung) include it. It removes what a brush cannot: hardened tartar (Zahnstein) at the margins, biofilm under bridge pontics, staining on polished surfaces.
The bonus booklet is the financial reason. Every check-up gets a stamp in the Bonusheft. A booklet kept without gaps for five years raises the fixed subsidy (Festzuschuss) your fund pays towards new dental work from 60 % of standard care to 70 %; after ten complete years it is 75 %. If a bridge you already have needs replacing in twelve years’ time, the stamps you collected this decade will decide a three-figure difference in what you pay. Two appointments a year are therefore both clinical maintenance and financial insurance. We go through the money side properly in What fixed dental work costs in Germany.
What's normal — and when to contact us
Nothing on the second list is an emergency in the sense of needing a night visit — but none of it improves on its own, and all of it is cheaper to fix early. If a crown or bridge comes off entirely, keep it, do not attempt to glue it back with household adhesive, and call us; outside normal hours the regional out-of-hours service (Notdienst) covers acute problems.
If you are new to Germany, or your German is limited
Dental hygiene instruction is a conversation, not a leaflet — and it is a conversation full of vocabulary nobody teaches in an integration course. Patients regularly tell us they nodded through an explanation of interdental brush sizes and then bought the wrong ones.
You are entitled to understand your own mouth. Ask for the explanation in English; ask to be shown on a model; ask for the brush sizes to be written down. We treat patients in English as a matter of course, and for people who have just moved to NRW we have put the practical side of the system — insurance cards, appointments, what to say on the phone — into English-Speaking Dentist in NRW. For expats in Düsseldorf, Cologne or Bonn, the 20 to 30 minutes to Wuppertal is a normal commute for an appointment you can actually follow.
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Not as a straight swap. A water flosser rinses out loose food and reduces bleeding for many people, but the biofilm at a crown margin sticks and needs mechanical contact to be removed. Use both if you like the water flosser — brush and interdental brushes first, water flosser after.
The more abrasive products slowly dull the polished glaze, and a dull surface picks up stain faster than a smooth one. They also cannot lighten the restoration itself, so the usual result is that your natural teeth brighten slightly and the crown starts to stand out. A normal fluoride toothpaste is the safer everyday choice.
Almost always because nothing is passing under the pontic. Brushing cleans the outside of a bridge; the underside is a sheltered surface that collects plaque until something physically wipes it. Start a daily superfloss pass and the odour usually settles within a week or two. If it does not, have the bridge checked — leaking cement or caries at an abutment tooth smells the same way.
Yes, and more carefully than before. The crown protects the visible surfaces; the point where it ends is a fine junction sitting at the gum, and that junction is where decay on the remaining natural tooth begins. Interdental cleaning is what reaches it.
For most people with crowns, bridges or implants, twice a year is a sensible baseline, and patients with gum disease in their history are often advised to come more often. The interval is a clinical judgement based on how your gums look and how much tartar you form between visits.
Fixed dental work shifts the maintenance job rather than removing it. The ceramic looks after itself; the tooth and the gum around it do not. Two minutes of brushing at the gum line, one pass with correctly sized interdental brushes, one pass with superfloss under every bridge, and a check-up twice a year with a stamp in the Bonusheft — that is the whole programme, and it is the difference between a bridge that quietly does its job for many years and one that has to be remade because of a problem nobody could see.
Zahnarztpraxis Tsypin · Wuppertal. This article was medically reviewed and is provided for information; it does not replace an examination. Updated August 2026.
