How Long Do Crowns, Fillings, and Implants Last?
Composite fillings commonly last five to ten years, crowns often last ten to fifteen years or longer, and dental implants can last decades when the surrounding bone and gum stay healthy. Longevity depends more on hygiene, grinding habits, and bite forces than on the material itself. No restoration is permanent, and every one requires monitoring.
Patients ask this question right before committing to treatment. It is the correct question to ask.
Understanding realistic lifespans helps you compare options and plan financially. It also explains why your dentist keeps checking work that feels fine.
Why No Restoration Lasts Forever
Your mouth is a hostile environment for materials. Consider what a restoration endures.
Temperature swings from ice water to hot coffee cause expansion and contraction. Chewing applies force thousands of times daily. Acids from food and bacteria attack margins. Saliva bathes everything constantly.
Every restoration has a margin, the seam where the material meets the tooth. Margins are where failure begins. Bacteria eventually find a microscopic gap and start decay underneath.
Composite Fillings
Tooth-colored composite bonds directly to the tooth. Most last roughly five to ten years, though many go longer.
Size affects lifespan more than anything else. Small fillings in low-stress areas often outlive large ones by years. A large filling replacing much of a molar flexes under chewing load and eventually chips or leaks.
Location matters too. Fillings on chewing surfaces of molars absorb the most force. Fillings near the gumline face fewer forces but more moisture during placement, which affects the bond.
Amalgam Fillings
Silver amalgam fillings frequently last ten to fifteen years or more. Many patients have amalgams from childhood still functioning.
Amalgam wears well but does not bond to the tooth. Over decades it can expand slightly, contributing to cracks in the remaining tooth structure. Dentists often recommend replacing very old amalgams with a crown once cracks appear.
Most practices now use composite for new fillings, largely for appearance and for the ability to bond conservatively.
Crowns
Crowns typically last ten to fifteen years, and many survive well beyond twenty. Material influences the outcome.
- Zirconia offers high fracture resistance and performs well on molars
- Porcelain fused to metal provides strength with acceptable appearance
- All-ceramic and lithium disilicate deliver the best appearance for front teeth
- Gold wears the most like natural enamel and lasts a very long time, though few patients choose it now
Crowns almost never fail because the crown itself broke. They fail because decay developed at the margin, or because the underlying tooth cracked. That distinction explains why hygiene affects crown longevity so much.
Root Canal Treated Teeth
A properly restored tooth after root canal therapy can function for decades. The American Association of Endodontists reports that root canal treatment has a high success rate and is often preferable to extraction when the tooth is restorable.
The restoration on top determines the outcome. A root canal treated molar without a crown fractures far more often, since the tooth is hollowed and brittle.
Dental Implants
Implants have two components with different lifespans.
The titanium post fuses to bone and can last decades, often for life. The crown attached to it behaves like any other crown and may need replacement after ten to fifteen years.
Implant survival depends on bone and gum health around the post. Peri-implantitis, an inflammatory condition around an implant, causes bone loss and is the leading reason implants fail. Smoking, uncontrolled diabetes, and poor hygiene all raise that risk substantially.
Comparing options for a missing tooth? Review the differences between dental bridges and implants before deciding.
Bridges and Dentures
Fixed bridges commonly last ten to fifteen years. The abutment teeth supporting the bridge determine longevity, since decay in either one compromises the whole unit.
Full and partial dentures typically need relining every few years and replacement roughly every five to ten. Jawbone changes shape after tooth loss, so the fit shifts even when the denture itself remains intact.
What Shortens Restoration Life
Some factors sit within your control, and they matter more than material choice.
- Grinding and clenching. Nighttime forces exceed normal chewing dramatically. A night guard protects your investment.
- Inconsistent hygiene. Decay at margins ends more restorations than fracture does.
- Skipping checkups. Small margin failures are repairable. Advanced ones require replacement or extraction.
- Chewing ice and hard candy. Point loads crack ceramic and composite alike.
- Untreated acid reflux. Chronic acid exposure erodes both enamel and restoration margins.
- Tobacco use. Smoking raises implant failure and gum disease risk considerably.
Regular preventive care allows small repairs before they become large ones.
Frequently Asked Questions
How do I know when a filling needs replacing?
Signs include sensitivity, a rough edge you can feel with your tongue, visible staining at the margin, or food consistently catching in one spot. X-rays often reveal decay under a filling before you notice anything.
Will insurance pay to replace an old crown?
Many plans cover replacement, but most require the existing crown to be a certain age, often five to eight years. Ask the front office to verify your benefits before treatment.
Do implants ever get cavities?
No. Titanium and the attached crown cannot decay. The surrounding gum and bone can still become infected, which is why daily cleaning around an implant remains essential.
Is a crown better than a large filling?
For a tooth that has lost significant structure, usually yes. Crowns distribute chewing force across the whole tooth, while a large filling leaves thin walls that can fracture.
Can I extend the life of my restorations?
Yes. Consistent brushing and flossing, a night guard if you grind, avoiding ice and hard candy, and keeping regular exams all add years.
Reviewed by Dr. Richard Stoker, DMD
This article is for informational purposes only and does not constitute medical or dental advice. Lifespans vary by patient. Consult a qualified dentist for recommendations specific to your situation.
