Why Do My Crowns Keep Breaking? Finding the Cause Before Replacing Them Again in Washington, DC

Practice clinician: Gerald M. Marlin, DMD, MSD, prosthodontist, Elite Prosthetic Dentistry, Friendship Heights, Washington, DC. Last updated October 30, 2026.

A crown that breaks once may be bad luck. Crowns that keep breaking, chipping or coming loose are a pattern, and the pattern has a cause. Replacing each one as it fails, with the same design and the same material, treats the symptom. This guide explains what a prosthodontist looks for when crowns repeatedly fail, why the bite is usually at the center of it, and what to ask before you pay to rebuild the same teeth again.

Patients who come to Elite Prosthetic Dentistry with this problem have usually already spent considerable time and money. A crown fractured and was replaced. A different crown chipped. A bridge came loose, was recemented, and came loose again. Each repair was reasonable on its own. Together they describe a mouth in which the forces are not under control, and until that is understood, every new restoration is placed into the same conditions that broke the last one.

Why Crowns Fracture: The Usual Causes

Clenching and grinding (bruxism). The jaw muscles can generate forces during sleep far beyond those used in chewing. Porcelain, which performs well under normal loads, chips and fractures under repeated heavy loading, especially at edges and where it is thin. Worn, flattened teeth, flattened edges on crowns, and muscle soreness on waking are common signs.

An uneven bite. When the teeth do not meet evenly, a few teeth carry the load that should be shared by many. Those teeth, and their restorations, fail first. An uneven bite can result from the original restorations being made without a careful bite record, from teeth shifting after a tooth was lost, or from wear that changed the way the jaw closes.

Lost or shortened back teeth. Back teeth absorb most chewing force. When they are missing, worn down or restored too short, the front teeth and their restorations take force they were never designed to carry. Front crowns that keep chipping often point to a problem at the back of the mouth.

Loss of bite height. Years of wear can reduce the vertical height of the bite. Restorations made at that collapsed height are compromised from the start, and the jaw position that results can concentrate force in ways that break them.

Design and material. A crown made too thin to fit without adjusting the bite, porcelain layered over a framework in a way that leaves it unsupported, or a material selected for appearance in a mouth that needs strength, will fail even in a reasonable bite. A crown designed for a patient who grinds is a different object from one designed for a patient who does not.

Problems beneath the crown. Decay at the margin, a cracked root or a tooth that has lost structure can cause a crown to loosen or fracture. These need to be ruled out, because they change the plan for the tooth itself.

Most patients with repeated fractures have more than one of these at work. The evaluation’s job is to identify which, and in what proportion.

Why the Same Replacement Produces the Same Result

A crown is designed for the conditions it will live in. If the conditions are heavy grinding, an uneven bite and missing back teeth, a crown made exactly like the one that just broke will meet the same forces and fail the same way, usually faster, because the tooth beneath it has lost more structure with each replacement. The useful question is not “what crown should replace this one” but “what is breaking my crowns, and what has to change so the next restoration survives.”

Sometimes the answer is modest: adjust the bite, make a night guard, and replace the one crown in a material and design suited to the forces. Sometimes the answer is that the bite as a whole needs to be rebuilt, because the pattern of wear and failure has gone too far for single-tooth repairs to hold. Our guide on full mouth reconstruction covers that decision. The evaluation is what tells you which situation you are in.

What a Prosthodontic Bite Evaluation Looks At

• Wear patterns on natural teeth and restorations, which show where force is concentrated and in what direction the jaw moves.
• How the teeth meet when the jaw is seated, and whether that differs from how they meet when the patient bites down habitually.
• Which teeth are missing, shortened or heavily restored, and what that does to load distribution.
• The vertical height of the bite and whether it has been lost to wear.
• The jaw joints and muscles, assessed separately from the teeth, so that joint symptoms are not assumed to be caused or cured by restorations.
• Each existing restoration: material, thickness, margins, and the condition of the tooth beneath it, with imaging where indicated.
• Mounted models and, where the case warrants, a diagnostic wax-up that shows what a rebuilt bite would look like before anything is done.

The result is a diagnosis of the force problem, not just a list of broken crowns.

How Elite Prosthetic Dentistry Approaches Repeated Fractures

The practice treats repeated restoration failure as a bite problem first. Dr. Gerald M. Marlin examines the wear pattern, the jaw function and the existing restorations before recommending replacement of anything. Where a limited correction is sufficient, that is the recommendation. Where the bite needs to be rebuilt, the plan is developed on mounted models and a diagnostic wax-up, verified in provisional restorations the patient wears and tests, and then completed in the practice’s on-site laboratory in materials chosen for the patient’s forces. A night guard is made for patients who grind, as protection for the result rather than as a substitute for the diagnosis.

Jaw pain, clicking or headaches are evaluated and reported separately from the restorative findings. Rebuilding the bite is undertaken to restore the teeth and their function; it is not promised as a treatment for joint or muscle symptoms, which have their own evaluation. Our guide on who treats TMJ explains that distinction.

When Another Setting Fits Better

A single fractured crown in a mouth with an even bite, intact back teeth and no history of grinding is a routine repair that a general dentist can handle well. A patient whose primary complaint is jaw pain without significant tooth wear or restoration failure is better served by an orofacial pain evaluation first. A patient with active decay or periodontal disease across the mouth needs that disease controlled before restorations are planned. The evaluation will say which applies.

Documented Cases That Show the Decision

• A fractured filling led to the discovery of generalized wear and a collapsed bite: crown lengthening, a diagnostic wax-up, upper and lower zirconia-ceramic crowns and a night guard.
• A severe teeth grinder has his worn-down teeth restored: the bite rebuilt for the forces that destroyed the original teeth.
• Worn teeth rebuilt for a stable, natural, long-lasting result.
• Older implant crowns redesigned for a better bite and more natural appearance: restoration design corrected rather than simply replaced.
• Both arches rebuilt after years of heavy grinding destroyed the teeth: a case in which the teeth were past saving and the plan had to account for the same forces.

More cases are organized in the full mouth reconstruction success story hub.

Related Reading

• Can worn-down teeth be fixed, or do they have to be replaced?
• Should you wear your dental night guard during the day?
• When multiple restorations start failing at once
• When to replace old crowns and bridges
• How to choose a dentist for crowns in Washington, DC

Request a Bite Evaluation

If your crowns, veneers or bridges keep failing, request an appointment or call (202) 244-2101. Bring any broken pieces, previous X-rays and a list of what has been replaced and when; the history is part of the diagnosis.