How Long Do Dental Fillings Last? What Affects Their Lifespan
A filling isn't permanent — but it should last you a lot longer than most people expect, if it's the right material placed correctly and cared for well. How long depends on what it's made of, where it is in your mouth, and habits you may not realize are working against it. Here's what actually determines a filling's lifespan, and how to know when yours is due for a look.
The short answer
Most dental fillings last somewhere between 7 and 15 years, though the range is wide because it depends heavily on material and location. Composite (tooth-colored) fillings on average last 7 to 10 years. Amalgam (silver) fillings, while less common today, can last 10 to 15 years or longer. A temporary filling is designed to last only a few weeks to a few months — if you have one, you should already have a follow-up scheduled.
None of these numbers are guarantees. A filling that's well-placed and well-maintained can outlast the average significantly. One under constant stress from grinding or poor hygiene can fail well before it "should."
Lifespan by filling material
| Material | Typical lifespan | Notes |
|---|---|---|
| Composite (resin) | 7–10 years | Tooth-colored, bonds directly to enamel, most common today |
| Amalgam (silver) | 10–15+ years | Highly durable, but visible and less commonly used now |
| Glass ionomer | 5–7 years | Releases fluoride, often used for children or small cavities |
| Gold | 15–20+ years | Extremely durable, rarely used due to cost and appearance |
| Temporary filling | Days to a few months | Placeholder only — meant to be replaced with a permanent filling |
Temporary fillings are a placeholder, not a long-term solution. They're softer and more prone to wearing down or falling out. If you were given one — often after a root canal or while waiting on a permanent crown — make sure a follow-up appointment is already on the calendar. Leaving a temporary filling in place too long risks bacteria getting underneath it.
What actually determines how long a filling lasts
Location in the mouth
Back teeth (molars) absorb significantly more chewing force than front teeth. A filling on a molar wears down faster than the same material placed on a front tooth, simply due to the mechanical load it's under every time you eat.
Size of the filling
A small filling has less surface area exposed to stress and bacteria. A large filling — one that replaces a significant portion of the tooth — has more edges where it can begin to break down, and less surrounding healthy tooth structure to support it.
Your bite
If your bite is uneven, certain teeth — and the fillings in them — take on disproportionate force every time you chew or clench. This is one of the most overlooked factors in premature filling failure. A filling can be placed perfectly and still fail early if the bite around it isn't balanced.
Grinding or clenching
Nighttime grinding (bruxism) puts repeated, forceful pressure on fillings — far more than normal chewing. If you wake up with jaw soreness or your dentist has mentioned wear patterns on your teeth, your fillings are likely under more stress than average, regardless of how well they were placed.
Oral hygiene around the filling
Fillings don't get cavities themselves, but the tooth structure surrounding a filling can — particularly at the margin where the filling meets natural enamel. Poor hygiene allows decay to develop at that edge, which can undermine the filling even if the filling material itself is intact.
Diet and habits
Chewing ice, hard candy, or non-food objects, and frequent exposure to acidic or sugary foods and drinks, all accelerate wear on both fillings and natural teeth alike.
When a filling fails well before its expected lifespan, it's rarely the material's fault. More often it's a bite imbalance, undiagnosed grinding, or decay developing at the margin that went unnoticed. At Complete Health Dentistry, we evaluate bite function and wear patterns as part of every exam — not just whether a filling is cracked or intact — so we can catch what's actually putting it at risk before it fails.
Signs your filling may need attention
Most failing fillings give some warning before they fail completely. Watch for:
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Sharp edges or rough texture Run your tongue over the filling. A rough or jagged feel often means a small chip or wear has occurred at the edge.
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New sensitivity to hot, cold, or sweet Sensitivity that wasn't there before can indicate the seal between the filling and tooth has broken down, allowing temperature or sugar to reach the nerve.
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Visible cracks or dark margins A dark line forming around the edge of a filling can indicate decay developing underneath or beside it — not necessarily a problem with the filling material itself.
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A piece feels like it's missing Even a small chip changes how the filling protects the tooth underneath. Don't wait for the whole thing to come out.
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Pain when biting down This can mean the filling is sitting too high, has shifted, or there's a crack in the tooth itself — all worth a prompt evaluation.
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The filling falls out entirely This happens more often than people expect, especially with older or large fillings. It's not an emergency in most cases, but it should be addressed within a few days to protect the exposed tooth.
Can a filling fall out, and is that an emergency?
Yes, fillings can and do fall out — usually from age, decay developing underneath, or significant force from grinding or biting something hard. It's rarely a dental emergency, but the exposed tooth is more vulnerable to sensitivity, further decay, and breakage the longer it goes unaddressed. If your filling falls out, avoid chewing on that side, keep the area clean, and schedule an appointment within a few days rather than waiting for your next routine cleaning.
What to expect during a filling replacement
Replacing a filling is similar to getting a new one. Your dentist removes the old filling material along with any decay found underneath, evaluates how much healthy tooth structure remains, and places a new filling — or, if the damage is more extensive than expected, may recommend a crown instead. This is part of why regular exams matter: catching a failing filling early usually means the fix stays simple. Learn more about how we decide between a filling and a crown →
Frequently asked questions
How often do dental fillings need to be replaced?
There's no fixed schedule — fillings are replaced when they show signs of wear, damage, or decay underneath, not on a set timeline. Composite fillings are typically reevaluated every 7 to 10 years during routine exams, but a dentist will flag one sooner if there's visible wear, sensitivity, or a margin that's no longer sealed properly.
Can a dental filling fall out on its own?
Yes. This typically happens due to age-related wear, decay developing beneath the filling that weakens its hold, or excess force from grinding or chewing something hard. It's usually not an emergency, but the exposed tooth should be evaluated within a few days to prevent further decay or sensitivity.
How long does a temporary filling last?
Temporary fillings are designed to last a few weeks to a few months at most — they're a placeholder while you wait for a permanent filling or crown. They're softer and more prone to wearing down, so it's important to keep the follow-up appointment your dentist scheduled rather than leaving a temporary filling in place indefinitely.
How long does numbness last after a filling?
Local anesthesia typically wears off within 2 to 4 hours, though this varies based on the type used and individual metabolism. Avoid chewing on the numb side until sensation fully returns, to prevent accidentally biting your cheek, tongue, or lip without realizing it.
Can you eat normally after getting a filling?
For composite fillings, the material hardens immediately under a curing light, so you can eat once the numbness wears off — typically within an hour or two. It's wise to avoid very hard or sticky foods for the first 24 hours while everything settles. Amalgam fillings need a bit longer, generally 24 hours, before chewing directly on that tooth.
Does dental insurance cover filling replacement?
Most dental insurance plans cover filling replacement when it's medically necessary — for example, due to decay, damage, or failure — though coverage details, frequency limits, and material restrictions vary by plan. It's worth confirming your specific benefits before treatment, and our office is happy to help you understand what's covered.
Not sure if your filling needs attention?
We'll take a thorough look — checking the filling itself, the margins around it, and your bite — to make sure nothing's quietly wearing down before it becomes a bigger problem.
Schedule an exam