How long do fillings last? Lifespan by material, warning signs, and how to make yours last

How long do fillings last? Most last about ten years or more, but the real answer depends on you, the tooth, and the size of the filling more than on the material. Large studies of back-tooth composite fillings report yearly failure rates of roughly 1 to 3 percent, which means the majority are still working a decade later. The ones that fail early usually share the same causes: new decay at the edge, a break from heavy bite force, or a big filling asked to do the work of a missing tooth. A failing filling often does not hurt, so a quick exam with X-rays is the reliable way to know whether yours is due. You can schedule an appointment online or call (352) 717-2177.

Worried about an old filling? Neola Dental is a privately owned, non-corporate practice in Minneola. We look at the condition of your filling, not just its age. Call (352) 717-2177.

So how long do fillings actually last?

Dentists avoid a single number because the research gives a failure rate per year instead.

A review of 34 clinical trials of back-tooth composite fillings, each followed for at least five years, found that 90 percent of those studies reported annual failure rates between 1 and 3 percent. At 1 percent a year, about nine out of ten fillings are still in place after ten years. At 3 percent a year, closer to three out of four are. Both numbers are arithmetic from the published range, not a promise about your tooth.

The same review found that the material itself had only a minor effect. What moved the numbers were the tooth, the dentist, the patient's cavity risk, and habits. Several of those are in your hands.

How long do composite (tooth-colored) fillings last?

Composite is a mix of plastic resin and fine glass particles that your dentist shades to match your tooth. It is our default recommendation at Neola Dental for most cavities, front or back. Our guide to tooth-colored fillings and what they cost in Minneola covers the material and the price factors.

A second analysis pooled the records of 2,816 composite fillings from 12 studies, each followed for at least five years. Of those, 569 failed during the observation period, mainly from new decay and fracture. So a well-placed composite filling can pass the ten-year mark, and it can also fail much sooner in a mouth with high decay activity. The material does not decide which one you get.

How long do amalgam (silver) fillings last?

Amalgam is the traditional silver-colored filling. It has a reputation for durability, and one of the best comparisons backs that up, with a caveat.

In a randomized clinical trial in Portugal, 472 children aged 8 to 12 received either amalgam or composite fillings in their back teeth, and the dentists followed them for up to seven years. The survival rate was 94.4 percent for amalgam and 85.5 percent for composite. Annual failure rates ranged from 0.16 to 2.83 percent for amalgam and from 0.94 to 9.43 percent for composite. New decay at the edge was the leading reason for failure in both, and its risk was 3.5 times higher in the composite group. The gap was widest in large fillings that covered more than three surfaces.

Keep the limits in mind. The participants were children, a high decay risk group, and the fillings were placed years ago. It does not mean composite is a poor choice for you. It does show why a large cavity in a back tooth is a different conversation than a small one, and why some of those teeth do better with an inlay, onlay, or crown. Most patients choose tooth-colored fillings because they look natural, and that is a reasonable choice for most cavities.

What about glass ionomer, ceramic, and gold?

Gold inlays last the longest. The American Dental Association describes this type of restoration as usually considered the most durable, lasting 20 years or more, though it is also the most costly. Gold does not look natural, so few patients choose it for a visible tooth.

Ceramic (porcelain) inlays and onlays are tooth-colored restorations made to fit the tooth and bonded in place. They suit a tooth that has lost too much structure for a plain filling but does not need a full crown. We do not quote a lifespan, because the figure depends heavily on the tooth and the type of ceramic.

Glass ionomer is a material that releases fluoride, so dentists use it in particular situations, such as baby teeth or areas near the gumline. We leave out a lifespan on purpose, because the right figure depends on where it is used.

If your tooth needs more than a standard filling, our crowns page explains the full-coverage option.

What shortens the life of a filling?

The main long-term reason fillings fail is new decay at the edge, which the research calls secondary caries. Bacteria find the tiny seam between the filling and the tooth, and decay starts there. People who get cavities easily, because of diet or dry mouth, see more of it.

The other main cause is fracture: a filling that cracks, or a tooth that splits around it. Heavy bite force and bruxism raise that risk.

Size matters too. One analysis found a significantly higher risk of failure in people at high cavity risk and in fillings that covered more surfaces of the tooth. The more of your own tooth a filling replaces, the harder it works.

Habits add to it. Chewing ice, biting nails, opening packages with your teeth, and sipping sugary drinks all day add up. So does grinding.

How does grinding affect fillings?

Grinding and clenching, called bruxism, put far more force on your teeth than chewing does, and they do it for hours while you sleep. A filling is weaker than natural enamel, so it takes the damage first.

The review of long-term composite studies lists fracture as one of the main reasons fillings fail and names bruxism among the patient factors involved. The National Institute of Dental and Craniofacial Research also notes that people can grind in their sleep without knowing it, and that part of a bruxism exam is looking for dental restorations that have been damaged.

If you wake with a sore jaw, a morning headache, or worn tooth edges, tell us. A custom night guard separates the teeth while you sleep, and the NIDCR describes mouth guards as a way to prevent tooth damage. Our post on how to stop grinding your teeth covers the causes and the other things that help.

Signs a filling is failing

A failing filling often gives hints before it gives pain.

• Sensitivity to cold, sweets, or pressure on that tooth
• Pain when you bite down, or a filling that feels high or uneven
• A rough or sharp edge that catches your tongue
• Floss that snags or shreds at one spot
• A visible chip, crack, or missing piece
• A dark line or stain around the edge of the filling
• Food that packs into a gap that was not there before

The most important sign is the one you cannot feel. Decay under a filling can grow silently, and an X-ray is often the only way to see it. That is why we check every filling at your exam. If a filling comes out entirely, our guide on what to do when a filling falls out walks through the first steps.

Does a filling need replacing just because it is old?

No. Dentists replace a filling because of its condition, not its birthday. A ten-year-old filling that is sealed at the edges, intact, and free of decay underneath can stay. A three-year-old filling with a gap and new decay should not. Replacing a sound filling just to renew it removes healthy tooth for no benefit, and every replacement makes the hole a little bigger.

What happens when a filling is replaced?

Replacement is a routine visit.

1. Exam and X-ray. We look at the filling, the tooth, and what is going on underneath.
2. Numbing. We numb the area so you feel pressure but not pain.
3. Removal. We take out the old filling and any decay beneath it.
4. Assessment. We check how much healthy tooth remains. This decides what comes next.
5. Rebuilding. If the tooth is solid, we place a new filling. If too much is missing or cracked, an inlay, onlay, or crown protects it better.
6. Bite check. We adjust the filling so it feels natural when you close your teeth.

If a small chip or edge defect is the only problem, we may be able to repair that part and keep the rest. We tell you plainly which option fits.

Costs depend on the tooth, the size, and your insurance, so we do not guess online. We work with major PPO brands and Medicare Advantage plans with dental benefits, and our team verifies your benefits before treatment.

How to make your fillings last longer

• Brush twice a day with fluoride toothpaste and clean between your teeth daily. The edge of a filling is the first place decay returns.
• Keep your regular cleanings. A professional cleaning removes buildup you cannot, and the exam that comes with it is where we catch a failing filling early.
• Wear a night guard if you grind. It is the single most effective protection for fillings, crowns, and enamel.
• Cut back on constant sipping and snacking. Sugary or acidic drinks sipped over hours keep your enamel under attack.
• Do not use your teeth as tools. Ice and pen caps break fillings.
• Treat dry mouth. Saliva repairs enamel, and a dry mouth raises your cavity risk. Tell us if a medication dries you out.
• Speak up early. A small problem found early is often a repair. A problem found late is often a crown.

Should I have my old fillings checked?

Yes. An exam with X-rays tells you where each filling stands. We note the ones to watch and leave the sound ones alone. If you live in Minneola, Clermont, Groveland, Winter Garden, Mascotte, Montverde, or elsewhere in Lake County, you can find us at 825 US-27 #104 in Minneola with bilingual English and Spanish staff. Dr. Josaida Contreras can review your fillings and explain what each one needs. Call (352) 717-2177 or book online.

Frequently asked questions about how long fillings last

How long do fillings usually last?

There is no single number. A review of 34 clinical studies found that 90 percent reported yearly failure rates of 1 to 3 percent for back-tooth composite fillings. In plain terms, many last ten years or more, and some fail much sooner. Your cavity risk, the size of the filling, and habits like grinding matter more than the brand of material.

Do amalgam fillings last longer than composite fillings?

In one randomized trial of children followed for up to seven years, 94.4 percent of amalgam fillings survived compared with 85.5 percent of composite fillings, and the gap was widest in large, multi-surface fillings. That study involved children and older materials, so it does not predict your result. Today, tooth-colored composite is the standard for most fillings.

What are the signs that a filling needs to be replaced?

Watch for new sensitivity to cold, sweets, or biting, a rough or sharp edge, floss that catches or shreds, a chip or crack in the filling, a dark line around its edge, or a food trap that was not there before. Many failing fillings cause no pain at all, which is why your dentist checks them at every exam and with X-rays.

Can a filling be repaired instead of replaced?

Sometimes. If the problem is a small chip or a limited defect at the edge and the rest of the filling is sound, the dentist can repair the filling rather than remove all of it. Published reviews describe repair as a viable alternative to full replacement that can extend a filling's life. If the damage is larger, a new filling, inlay, onlay, or crown protects the tooth better.

Does grinding my teeth shorten the life of a filling?

Yes. Research on composite fillings lists fracture as a main reason for failure, and bruxism is one of the patient factors tied to it. Grinding puts far more force on a filling than chewing does. A custom night guard separates your teeth while you sleep and takes much of that force off your fillings, crowns, and natural enamel.

Sources

• Demarco FF et al. - Longevity of posterior composite restorations: not only a matter of materials. Dental Materials, 2012 (PubMed)
• Opdam NJ et al. - Longevity of posterior composite restorations: a systematic review and meta-analysis. Journal of Dental Research, 2014 (PubMed)
• Bernardo M et al. - Survival and reasons for failure of amalgam versus composite posterior restorations placed in a randomized clinical trial. Journal of the American Dental Association, 2007 (PubMed)
• American Dental Association, MouthHealthy - Fillings (Gold Inlays)
• National Institute of Dental and Craniofacial Research - Bruxism