Common Problems with Crowns and Bridges and How to Avoid Them

By New Dental Center, Al Ain, UAE · Crowns and Bridges

Crowns and bridges are reliable, well-established restorations, but like any dental treatment they are not entirely immune to complications. Knowing what can go wrong, why it happens, and how it is typically resolved can help you respond calmly and quickly if an issue arises, rather than panicking or ignoring a problem that is simple to fix early but harder to fix later.

A Loose or Dislodged Crown

Over time, the cement holding a crown in place can weaken, sometimes due to decay developing underneath the crown, sometimes simply from years of chewing forces gradually breaking down the seal. A loose crown may feel like it is shifting slightly when you bite, or you may notice a gap has opened at the gum line. If a crown comes off entirely, it is important to keep it safe and see your dentist promptly, since the exposed tooth underneath is vulnerable to further damage and sensitivity in the meantime. In most cases, if the crown itself is intact and the tooth underneath is healthy, the same crown can simply be re-cemented.

Sensitivity After Placement

Some sensitivity to hot, cold, or pressure in the days following a new crown or bridge is common and usually settles within one to two weeks as the tooth and gum tissue adjust. This happens because the tooth preparation process, even when done carefully, causes some temporary irritation to the nerve inside the tooth. However, if sensitivity is severe, worsening, or persists well beyond two weeks, it can indicate that the bite is misaligned, that the nerve is more irritated than expected, or in rare cases that the tooth needs a root canal it did not previously require. This warrants a follow-up visit rather than waiting it out indefinitely.

A Bite That Feels Uneven

Immediately after a permanent crown or bridge is cemented, your bite should feel balanced, with the upper and lower teeth meeting evenly. Occasionally, a restoration can feel slightly high on one side, which is usually noticeable within the first day of normal chewing. This is a straightforward, quick adjustment at the dental office and should not be left unaddressed, since an uneven bite can put uneven stress on the tooth, the restoration, and even the jaw joint if left uncorrected for an extended period.

Gum Irritation or Recession Around the Margin

The margin, where the crown meets the natural tooth at the gum line, can sometimes become a site of irritation, particularly if plaque accumulates there due to inconsistent brushing, or if the crown's edge is not perfectly smooth. Over years, natural gum recession, which can happen with age or aggressive brushing, may expose the margin of an older crown, sometimes revealing a thin dark line in crowns with a metal substructure. Keeping up with gentle, thorough brushing along the gum line and attending regular cleanings helps minimize this risk.

Decay Developing Underneath a Crown

A crown protects the outer surface of a tooth, but it does not make the tooth immune to decay. If plaque and bacteria are allowed to accumulate at the margin over a long period, decay can develop in the natural tooth structure hidden beneath the crown, sometimes going unnoticed until it causes pain or the crown becomes loose. This is one of the most preventable complications, since consistent brushing, flossing, and regular dental checkups with x-rays allow decay to be caught and treated while it is still minor.

A Cracked or Chipped Restoration

Even durable materials like zirconia can chip or crack under enough force, particularly from biting hard objects, sudden trauma, or long-term undiagnosed grinding. A small chip on a porcelain surface may sometimes be smoothed or repaired, but a significant crack usually means the crown or bridge needs to be replaced entirely. Wearing a night guard if you grind your teeth, and being mindful about biting hard foods directly with a crowned tooth, meaningfully reduces this risk.

Frequently Asked Questions