Most dental fillings last between 5 and 20 years, depending on the material. Composite resin (tooth-colored) fillings typically need replacement after about 5 to 10 years, while silver amalgam fillings last 10 to 15 years or longer. Gold and ceramic restorations can go 15 to 20 years before they need attention. These are averages, though, and your actual timeline depends on where the filling is, how large it is, and how well you care for your teeth.
How Long Each Filling Material Lasts
The material your dentist used is the single biggest factor in how long your filling will hold up. A large systematic review comparing amalgam and composite restorations in back teeth found that amalgam had a median survival time exceeding 16 years, while composite came in around 11 years. Amalgam’s annual failure rate ranged from 0.16% to 2.83%, compared to 0.94% to 9.43% for composite. That gap is significant over time.
Here’s a general breakdown by material:
- Composite resin (tooth-colored): 5 to 10 years. These are the most common fillings placed today because they match your tooth color, but they wear faster, especially on chewing surfaces.
- Amalgam (silver): 10 to 15 years, often longer. Amalgam is extremely durable but has fallen out of favor for cosmetic reasons and concerns about mercury content.
- Ceramic (porcelain inlays and onlays): 10 to 15 years with proper care. A long-term clinical study found ceramic restorations had a cumulative survival rate of 93.9% after about 15 years and 91.7% after 23.5 years.
- Gold: 15 to 20 years. Gold restorations in the same study showed a survival rate of 92.6% at roughly 15 years and 91.8% at 23.5 years, making them nearly identical to ceramic in longevity.
If you’re wondering whether newer composite materials have closed the gap, the answer so far is no. Bioactive composites and bulk-fill formulations have been marketed as improvements, but clinical research shows they perform about the same as conventional composites in terms of survival, retention, and resistance to secondary decay. The technology may improve, but right now a composite filling placed in 2025 is expected to last roughly as long as one placed a decade ago.
Why Fillings Fail
Fillings don’t just fall out one day. They degrade gradually, and the most common reason for replacement is new decay forming around the edges of the old filling. This is called secondary caries, and it happens when the seal between the filling and your tooth breaks down over time. Bacteria seep into the gap, and the decay process starts over underneath the restoration where you can’t see it or reach it with a toothbrush.
Fracture is the second most common problem. Every time you chew, your fillings absorb force. Over years, this repeated stress can crack either the filling itself or the tooth around it. Composite fillings in premolars are particularly prone to fracture: one long-term study found fracture rates as high as 18% in composite premolar restorations. Amalgam fillings are more fracture-resistant but more vulnerable to secondary decay in molars.
At a microscopic level, enzymes in your saliva gradually weaken the bond between composite material and the underlying tooth structure. This slow chemical breakdown is part of why even well-placed fillings eventually lose their seal. Research published in Frontiers in Medicine found that this process is partly influenced by genetics, meaning some people break down fillings faster than others regardless of their oral hygiene habits.
What Speeds Up Replacement
Several habits and conditions can shorten a filling’s lifespan considerably. Teeth grinding (bruxism) puts enormous repeated force on fillings, especially while you sleep, and can crack both composite and ceramic restorations well before their expected lifespan. If you grind your teeth, a night guard is one of the most practical things you can do to protect your dental work.
Diet plays a major role too. Sugary and acidic foods feed the bacteria that cause secondary decay around filling margins. Sodas, fruit juices, and sticky snacks are the worst offenders. Frequent acid exposure also erodes the tooth structure around fillings, weakening the seal faster. The size and location of the filling matters as well. Larger fillings that replace more of the tooth’s structure are under greater mechanical stress and tend to fail sooner than small ones. Fillings on molars, which handle the heaviest chewing forces, wear out faster than those on front teeth.
Signs a Filling Needs Replacement
You won’t always feel it when a filling starts to fail. Many fillings develop problems that are only visible on an X-ray. But there are several warning signs worth paying attention to:
- Sharp pain or pressure when biting: This usually points to a crack or structural failure in the filling or the tooth underneath it.
- Lingering sensitivity to hot, cold, or sweet foods: Brief sensitivity after a temperature change can be normal, but if it lingers for several seconds or more, the seal around your filling may have broken down, allowing irritants to reach the nerve.
- A visible crack, chip, or rough edge: Even if it doesn’t hurt, a damaged filling is no longer protecting the tooth from bacteria. Decay can form underneath without causing symptoms until it’s advanced.
- Dark lines or shadows around the filling: Discoloration at the edges can be surface staining, but it can also indicate decay or leakage beneath the restoration.
- Food getting stuck in or around the tooth: If food starts catching where it didn’t before, the filling’s contour or seal may have changed.
Pain is actually a late sign. By the time a failing filling hurts, the decay underneath may be extensive enough to need a crown rather than a simple replacement filling. This is why routine dental visits matter even when nothing feels wrong.
How Dentists Check Your Fillings
During a checkup, your dentist evaluates fillings using several methods. They’ll visually inspect for cracks, chips, wear, and color changes. They’ll run a pointed instrument called an explorer along the edges of each filling, feeling for gaps, soft spots, or rough margins that suggest the seal has broken down. X-rays are the most important diagnostic tool for fillings because they reveal decay hiding underneath a restoration that looks fine on the surface. Your dentist will also check your bite to make sure the filling isn’t sitting too high, which creates uneven pressure that accelerates wear.
Not every imperfect filling needs immediate replacement. Small areas of wear or minor staining may be monitored over time. Your dentist is weighing the risk of leaving it against the reality that every replacement removes a little more tooth structure, so there’s a limit to how many times the same tooth can receive a new filling before it needs a crown.
How to Make Your Fillings Last Longer
The basics of oral hygiene have an outsized impact on filling longevity. Brushing twice a day with fluoride toothpaste and flossing daily keeps bacteria from colonizing the vulnerable margins around your restorations. Using an alcohol-free antibacterial mouthrinse adds another layer of protection.
Beyond brushing and flossing, the most impactful changes are dietary. Choosing water over sodas and juices reduces the acid exposure that erodes filling margins. Limiting sticky, sugary snacks cuts down on the bacterial activity that drives secondary decay. Avoiding chewing ice, hard candy, and other very hard foods reduces the mechanical stress that leads to fracture. If you grind your teeth at night, wearing a custom night guard protects both your fillings and your natural tooth structure.
Regular dental visits, at least once a year and more often if your dentist recommends it, let small problems get caught before they turn into big ones. A filling that’s starting to show wear at its edges can sometimes be repaired or sealed rather than fully replaced, buying you several more years before a complete redo is necessary.