A dental filling is one of the most common treatments in dentistry, yet it is rarely permanent. Fillings are designed to be durable, but over time they can wear, chip, or allow bacteria to creep in around the edges. Understanding how long they typically last and what affects their lifespan can help you look after your teeth more effectively between visits.
The answer depends on several factors: the material used, where the filling sits in your mouth, your oral hygiene habits, and whether you grind your teeth. If you have questions about tooth fillings and cavity repair, a routine dental check-up is a good place to start.
Quick Overview
- Dental fillings are restorations used to repair teeth affected by decay or damage, and they do not last forever.
- Lifespan varies significantly depending on the filling material, typically ranging from around five years to fifteen or more.
- Habits such as teeth grinding, diet, and oral hygiene all play a role in how long a filling holds up.
- Some fillings show early signs of wear before they cause symptoms, which is why regular check-ups matter.
- Whether an existing filling needs attention is something your dentist can assess during a routine visit.
Below, we explain the main filling types, what affects how long they last, and what signs to watch for.
What Are the Main Types of Dental Fillings?
Dental fillings come in several materials, and the type your dentist recommends depends on where the tooth is, the size of the cavity, and your individual needs. Dental fillings repair decayed teeth, with material chosen based on the tooth’s location and the extent of decay.
Composite resin (tooth-coloured fillings): Composite is the most commonly placed filling material in Australia. It is matched to the natural colour of the tooth and bonds directly to the tooth surface. Composite fillings are well-suited to visible teeth and smaller cavities. They typically last around five to ten years, though this varies depending on the location in the mouth and how the filling is cared for.
Amalgam (silver fillings): Amalgam is a durable metal alloy that has been used in dentistry for more than a century. It handles heavy chewing pressure well, making it suitable for back teeth. Amalgam fillings can last ten to fifteen years or longer, though their silver colour means they are more noticeable than tooth-coloured options. Amalgam is considered safe and effective for most people, according to the Australian Dental Association.
Glass ionomer cement: Glass ionomer is a tooth-coloured material that releases fluoride, which can offer some protection to the surrounding tooth structure. It is less hard-wearing than composite or amalgam and is often used for smaller cavities, children’s teeth, or as a temporary measure. Lifespan is generally shorter, often around five years or less.
Ceramic and porcelain fillings Ceramic and porcelain fillings are strong, stain-resistant, and closely match natural tooth colour. They can last up to fifteen years and are often used where aesthetics and durability are both priorities. They are generally more involved to place and may cost more than other options.
What Affects How Long a Filling Lasts?
Several factors influence whether a filling stays intact for five years or well beyond fifteen.
Location in the mouth. Back teeth (molars and premolars) absorb the most chewing force. Fillings in these teeth tend to wear more quickly than those in front teeth, which experience less pressure.
Teeth grinding and clenching. Bruxism, the habit of grinding or clenching the teeth, places significant mechanical stress on fillings. Teeth grinding wears down fillings faster than normal chewing and may cause chips or cracks. A custom occlusal splint worn at night can help protect both the filling and the natural tooth.
Diet. Frequent consumption of hard, crunchy, or sticky foods places an extra load on fillings. Acidic foods and drinks can also weaken the bond between the filling and the tooth over time.
Oral hygiene. Decay can develop around or beneath an existing filling if plaque is not removed consistently. Good daily habits reduce this risk significantly, which is why consistent home care matters alongside regular check-ups.
Size and age of the filling. Larger fillings have more surface area exposed to wear and stress. Older fillings, regardless of material, are more likely to have developed micro-cracks or marginal gaps that allow bacteria to enter.
How Do You Know When a Filling Needs Replacing?
Fillings do not always give obvious warning signs when they begin to fail. Some wear silently over many visits before becoming a problem, while others cause noticeable symptoms.
Signs that a filling may need attention include:
- Increased sensitivity to hot, cold, or sweet foods
- Pain or discomfort when biting down
- A rough or sharp edge you can feel with your tongue
- Visible cracking, chipping, or discolouration around the filling
- A sensation that something has shifted in your bite
Your dentist checks existing fillings at each appointment, sometimes using X-rays to detect decay that is not visible to the naked eye. Catching a failing filling early generally means less tooth structure is lost in the repair process.
How Can You Help a Filling Last Longer?
No filling lasts indefinitely, but the way you care for your teeth does influence how long it holds up.
- Brush twice a day with fluoride toothpaste, paying attention to the margins around existing fillings
- Floss daily to remove plaque from areas the brush cannot reach
- Limit sugary and acidic foods and drinks, which can weaken the filling bond over time
- Avoid biting down on very hard foods such as ice or hard sweets
- Wear a mouthguard at night if you grind or clench your teeth
- Attend regular dental check-ups so that wear or early failure is detected before it causes further damage
A Considered Approach to Filling Longevity
How long a dental filling lasts depends on the material used, the tooth it sits in, and how well it is maintained over time. Individual outcomes vary, and some fillings outlast their expected lifespan while others need attention sooner.
At Boutique Dental Care, the team can assess the condition of your existing fillings and discuss the options that suit your situation. Call (02) 9054 5281 or book an appointment online to discuss your dental health.
Note: Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.
Frequently Asked Questions
Can a dental filling fall out?
Yes, fillings can fall out, though it is not common. It can happen if the filling has aged and the bond to the tooth has weakened, if decay has developed underneath, or if a hard food has caused the filling to dislodge. If a filling comes out, avoid chewing on that side of your mouth and contact your dentist promptly. Leaving the cavity exposed can allow bacteria to enter and cause further decay.
Can I get a tooth-coloured filling to replace an old silver one?
Yes. Many people choose to have amalgam fillings replaced with composite resin when the original filling reaches the end of its lifespan. Whether this is appropriate depends on the condition of the tooth and how much natural tooth structure remains. Your dentist can assess the existing filling and discuss whether replacement is worth considering.
References
Healthdirect Australia. (2025). ‘Dental fillings’. Healthdirect Australia. Sydney, NSW: Australian Government. https://www.healthdirect.gov.au/dental-fillings
Better Health Channel. (n.d.). ‘Dental fillings’. Better Health Channel. Melbourne, VIC: Department of Health, State Government of Victoria. https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/dental-fillings
Teeth.org.au. (n.d.). ‘Dental fillings’. Teeth.org.au. Australia: Australian Dental Association. https://teeth.org.au/fillings
Australian Dental Association. (n.d.). ‘Policy Statement 6.18 – Safety of Dental Amalgam’. Australian Dental Association. Sydney, NSW: Australian Dental Association. https://ada.org.au/policy-statement-6-18-dental-amalgam