烤瓷牙和牙桥怎么清洁：让修复体更持久的正确方法

Many people assume that once a tooth is crowned, decay is no longer a worry. In fact, porcelain itself does not decay, but the natural tooth under the crown and the gum around it still can. Knowing how to clean dental crowns and bridges properly is what keeps crowns, bridges and veneers working for years. This guide covers where problems start, how to clean each type and which tools to keep at hand.

Porcelain does not decay, so why can crowns and bridges still fail?

According to Cleveland Clinic, if a bridge and the gum underneath are not cleaned, plaque and bacteria can cause gum inflammation or cavities, and decay in the supporting teeth weakens the whole bridge (Cleveland Clinic). Vietnam's Ministry of Health newspaper Suc khoe & Doi song (Vietnamese source) lists the causes of gum inflammation after crowning: poorly fitting crowns, rough margins and incomplete cleaning where the crown meets the natural tooth.

Long-term data show the risk is modest but real:

• Tan and colleagues (2004): a review of 19 studies with at least 5 years of follow-up. After 10 years, 89.1% of bridges were still in place; the risk of losing a bridge to decay was 2.6% and to periodontitis 0.7% (PubMed).
• Pjetursson and colleagues (2015): pooled 40 studies covering 1,796 metal-ceramic and 1,110 all-ceramic bridges; zirconia bridges had a significantly higher rate of decay in supporting teeth than metal-ceramic bridges (PubMed).

Both decay and periodontitis start with plaque, so daily cleaning is the part that is in your hands.

Crowns, bridges and veneers: where is cleaning hardest?

• Crowns: the margin where the crown meets the gum is where plaque collects most.
• Bridges: the gap under the pontic (the false tooth between two supporting teeth). The Oral Health Foundation advises cleaning under the false tooth with special floss or cleaning aids (Oral Health Foundation).
• Veneers: clean them like natural teeth, paying attention to the edge near the gum. Veneers can still chip, crack or come loose (Oral Health Foundation).

4 daily steps for cleaning crowns and bridges

Cleveland Clinic recommends brushing and cleaning between teeth every day, and cleaning under a bridge daily with floss threaders or interdental brushes. This can be grouped into four steps:

1. Brush the gumline around each crown: use a soft-bristled brush angled toward the gumline and brush gently around every crown, twice a day with fluoride toothpaste. See also how to brush your teeth properly.
2. Thread floss under the bridge: thread floss through a floss threader, or use superfloss with a built-in stiff end, pass it through the gap under the pontic, slide it gently back and forth beneath the false tooth, then wrap it around each supporting tooth. A correctly sized interdental brush is an alternative.
3. Water floss under the bridge: start on a low pressure, aim the jet into the gap under the pontic and trace along the gumline of the supporting teeth. This is an extra step, not a replacement for step 2.
4. Check-up visit: your dentist checks the fit of the crown margins, the supporting teeth and gums, and removes tartar. Vinmec recommends a check-up about every 6 months.

Water flossing under a bridge: helpful, but no substitute for floss

We did not find a clinical trial looking specifically at water flossers under tooth-supported bridges. Most of the available evidence is in implant patients, summarised in our article on water flossers for braces and implants.

A laboratory study by Sirinirund and colleagues (2023) is worth noting: 30 people cleaned implant crowns on model jaws coated with artificial plaque. Dental floss cleaned about 43% of the surface on average, superfloss about 42.5% and the water flosser only about 9.7%; no tool removed everything (PubMed). Artificial plaque on a model is not the same as real plaque in the mouth, but the result is a reminder to pair the water jet with floss or interdental brushes.

Suc khoe & Doi song advises using floss, interdental brushes or a water flosser as your dentist directs, since poor technique can also hurt the gums. For a detailed comparison of the two methods, see water flosser or dental floss.

Toothpaste and habits that help crowns last

• Fluoride, non-abrasive toothpaste: Cleveland Clinic recommends a non-abrasive fluoride toothpaste for people with bridges. Fluoride protects the natural tooth around the margins; see also fluoride toothpaste.
• Do not expect whitening to work on porcelain: according to Vinmec, whitening agents only act on natural tooth tissue; if porcelain looks dull from plaque or tartar, your dentist can clean and polish it.
• Avoid biting hard things: Cleveland Clinic advises people with crowns to avoid ice cubes, very hard nuts, popcorn kernels and very sticky sweets (Cleveland Clinic).
• Grind your teeth? Ask about a guard: Cleveland Clinic advises people who grind or clench to ask their dentist about a custom mouth guard.

Can you use an ultrasonic scaler on crowns?

It is best not to. Ultrasonic vibration can loosen crowns, veneers or bridges, and tartar around restorations should be left to your dentist. The reasons and safe-use tips are covered in our article on at-home tartar removers.

Inmax water flossers for people with crowns and bridges

• M131: 9 modes with a digital display, making it easy to raise pressure in small steps while you get used to cleaning under a bridge; 350 ml tank, 2,000 mAh battery, 40–130 PSI.
• M149Pro: a stand that keeps the tips by the sink, 4 modes (Pulse/Soft/Normal/Power), 300 ml tank, IPX7.
• M141Pro: two in one, the same handle works as a water flosser or takes an electric brush head; comes with 2 jet tips and 2 brush heads, 210 ml tank.

You can compare specifications or contact Inmax. Clinics and shops interested in stocking can see the dealer policy.

Frequently asked questions

Can a crowned tooth still get decay?

The porcelain itself cannot, but the natural tooth under the crown and the supporting teeth of a bridge can, usually starting at the margin near the gum.

How long do crowns and bridges last?

According to Cleveland Clinic, bridges last 5–15 years on average; crowns also average 5–15 years and can last over 30 years with good care.

Do I still need to floss if I use a water flosser?

Yes, ideally. A water flosser is an extra step; superfloss or an interdental brush is still needed to wipe plaque directly from under the pontic.

What if the gum around a crown often bleeds?

That can be a sign of gum inflammation. Clean thoroughly but gently, and see your dentist if it continues, because long-term inflammation can lead to periodontitis and gum recession.

This article is for reference only; the best care routine for your restoration is the one your treating dentist sets for you.