There is no single “normal” number of fillings at any age, but population averages give a rough sense of where most people land. Teenagers and young adults in countries with good preventive care often have zero to a few fillings, while adults over 60 commonly have around eight or nine filled teeth. The range is wide because filling counts depend on diet, fluoride exposure, saliva, dental access, and even the judgment calls of individual dentists. Understanding those averages and what drives them is more useful than chasing a magic number.
Average Filling Counts by Age Group
Among adolescents in a Brazilian cohort study, only about 17% had any filled teeth at the start of the observation period, and that figure rose to roughly 32% two years later. The biggest predictor of getting a filling was already having untreated decay, which more than doubled the average number of filled teeth a teenager had at follow-up.1Brazilian Oral Research. Factors associated with the number of filled teeth in adolescents from public schools: a cohort study So for teenagers, having zero fillings is common, and having one or two is not unusual. A handful of teens accumulate several, and those are almost always the ones who already had cavities going untreated.
By middle age, the picture shifts considerably. A study of Greek adults found an average combined score of about 14 decayed, missing, and filled teeth per person, with missing and filled surfaces making up the bulk of that number.2PubMed Central. Risk indicators of coronal and root caries in Greek middle aged adults and senior citizens That combined score includes teeth lost to extraction, so the number of teeth actually carrying fillings is lower than 14, but it signals that by your 40s and 50s most people have accumulated a meaningful history of dental work.
Among people 60 and older, the numbers are higher still. An examination of over 850 dentate adults aged 60-plus in South Australia found an average of about 8 filled teeth per person, alongside roughly 15 missing teeth and a small number of actively decayed ones.3PubMed. Distribution of coronal and root caries experience among persons aged 60+ in South Australia A Norwegian study of non-institutionalized pensioners reported a similar picture: an average of about 9 filled teeth, with 87% of participants having at least one filling.4PubMed. Decayed, missing, and filled teeth among elderly people in a Norwegian municipality The oldest group, those 80 and above, actually had fewer fillings than the 67-to-79-year-olds, but that is because they had more missing teeth. When a tooth has been extracted, it no longer counts as “filled.” So in older populations, the number of fillings can drop not because the mouth got healthier but because teeth that once had fillings are now gone.
Generational Trends and Why Younger Cohorts Have Fewer Fillings
If you are in your 20s or 30s and have fewer fillings than your parents did at the same age, that is not unusual. A multi-country analysis tracking caries trends across decades found that population-level decay scores have decreased over time in most developed countries, with the most recent generations generally showing lower caries levels than earlier ones.5PubMed Central. Age, period and cohort trends in caries of permanent teeth in four developed countries Fluoridated water, fluoride toothpaste, sealants, and better childhood nutrition all contributed. People born after 1970 in many Western countries grew up with these protections in place and entered adulthood with meaningfully fewer cavities than their grandparents had at the same age.
This means that comparing your filling count to that of an older relative is misleading. A 35-year-old with three fillings might be above average for their cohort while still having far fewer than what was typical for a 35-year-old born in 1950. “Normal” has moved.
What Drives the Differences Between People
Fillings are ultimately a treatment for tooth decay, so the question “how many fillings are normal” is really a question about what causes decay and how much of it you have been exposed to. Several factors matter more than age alone.
Sugar is the most straightforward driver. Frequent or high intake of sugary foods feeds the mouth bacteria that produce acid and dissolve enamel. This relationship has been consistently supported across epidemiological surveys, controlled studies, and population-level comparisons.6PubMed. Sugar and dental caries: a review of human studies It is not just how much sugar you eat but how often; sipping a sugary drink throughout the day bathes teeth in acid more than having dessert once after dinner.
Fluoride exposure makes a measurable difference over a lifetime. Adults with more than 75% of their life spent in fluoridated communities had roughly 10-11% fewer decayed, missing, and filled teeth compared with adults who spent less than 25% of their life in fluoridated areas, and the reduction in filled surfaces specifically was around 21-30%.7PubMed. Effects of fluoridated drinking water on dental caries in Australian adults A more recent study comparing adults in the Republic of Ireland (which has community water fluoridation) with adults in Northern Ireland (which largely does not) found about 10-16% lower caries experience in the fluoridated population, with the biggest differences on the surfaces between teeth.8PubMed. Long-Term Associations between Water Fluoridation and Adult Dental Caries These are not dramatic differences, but over decades they add up to a few fewer fillings for the average person.
Saliva flow, oral hygiene habits, individual bacterial ecology, and genetics also play roles. Some people do everything right and still get cavities; others are less careful and rarely do. These individual differences are real but hard to quantify in a way that gives you a personal “expected” number.
Income, Insurance, and the Treatment Gap
Two people with the same amount of tooth decay can end up with very different filling counts depending on whether they can afford dental care. This creates a paradox: having more fillings sometimes reflects better access to treatment, not worse oral health. A person with insurance and a regular dentist gets cavities caught early and filled. A person without access might carry untreated decay for years.
Research on U.S. dental-use patterns has found that income-based disparities in dental visits and untreated cavities have narrowed for children over recent decades but have actually widened for retirement-age adults.9PubMed Central. Disparities in Dental Use and Untreated Caries Prevalence by Income A decomposition analysis of treatment inequality in a Chinese population found that household income, education level, and type of insurance explained a substantial share of the gap in who received fillings for their cavities, with regular oral exams alone accounting for over 40% of the inequality in treatment.10PubMed Central. Greater inequalities in dental caries treatment than in caries experience In other words, the inequality in who gets treated is even larger than the inequality in who gets decay.
This means your filling count is as much a marker of your dental access as it is of your oral health. If you have eight fillings and your neighbor with similar habits has two, the difference might be that you saw a dentist regularly and they did not, leaving decay to progress to extractions instead of restorations.
How Long Fillings Last Before They Need Replacing
Once you have a filling, the clock starts ticking on how long it will survive before it needs repair or replacement. A systematic review of the evidence suggested that about half of all restorations last somewhere between 10 and 20 years, though the range was wide depending on the material, the dentist, the patient’s caries risk, and how many surfaces the filling covered.11British Dental Journal. How long do routine dental restorations last? A systematic review
A retrospective study comparing composite resin and amalgam restorations found survival rates around 82-92% at five years and 79-82% at ten years, with no significant difference between the two materials once you accounted for cavity size.12PubMed. A retrospective clinical study on longevity of posterior composite and amalgam restorations A prospective study following composite restorations placed in a public dental health setting reported a cumulative survival of about 84% at eight years, with an annual failure rate of roughly 2%.13PubMed. Longevity of posterior resin composite restorations in permanent teeth in Public Dental Health Service That study also found that fillings placed in younger patients and those covering more surfaces had shorter lifespans.
A meta-analysis focusing specifically on posterior composite restorations confirmed that people with high caries risk and fillings spanning more surfaces were at significantly greater risk of failure.14PubMed Central. Longevity of posterior composite restorations: a systematic review and meta-analysis The main reasons fillings fail are new decay forming around the margins of the old restoration and fracture of either the filling or the remaining tooth structure.
Amalgam fillings can last a very long time under ideal conditions. One analysis reported median survival times for amalgam ranging from about 7 to 45 years in private practice, and even longer in controlled academic settings. Composites showed median survival times of roughly 8 to 44 years in academic settings, though in general practice the evidence was thinner and long-term failure rates climbed steeply after about 15 years.15PubMed Central. Longevity of dental amalgam in comparison to composite materials So the material matters less than you might think; what matters more is the size of the cavity, your caries risk going forward, and the skill of the dentist who placed it.
The Replacement Cycle and Why Fillings Can Lead to More Fillings
One of the less intuitive facts about dental fillings is that having one increases your odds of eventually needing more work on that same tooth. Each time a filling is replaced, the new restoration tends to be larger. An analysis of over 1,300 replacement decisions found that about 70% of the time, a replacement filling covered more tooth surfaces than the one it replaced.16PubMed. Does the cycle of rerestoration lead to larger restorations? This progression from small filling to large filling to crown to extraction has been called the “restorative cycle” or “cycle of rerestoration,” and it highlights why avoiding an unnecessary first filling can be as important as getting a necessary one placed on time.
The primary trigger for replacing a filling is secondary caries, meaning new decay that develops at the junction between the filling material and the surrounding tooth. One study found that secondary caries accounted for about 74% of composite replacement decisions.17PubMed. Longevity of posterior dental restorations and reasons for failure Another large practice-based study reported that secondary caries (29%) and primary caries on a new surface (28%) together accounted for the majority of reasons fillings were placed or replaced, with margin fracture and tooth fracture covering most of the remainder.18PubMed. Influence of patient factors on age of restorations at failure and reasons for their placement and replacement
What triggers the decision to remove and replace a filling matters too. A retrospective analysis found that the strongest indicators for removing a filling were its age, visible imperfections at the margins, and the presence of visible secondary caries. Fillings removed purely because the patient requested it were usually found to be caries-free, suggesting that patient-driven removals are often premature.19PubMed Central. Decision criteria for replacement of fillings: a retrospective study If your dentist recommends replacing a filling, asking about the specific reason is reasonable. Visible cracks, marginal gaps, or clear evidence of new decay are solid indications. Cosmetic dissatisfaction alone is not.
The Overtreatment Question
A persistent concern in dentistry is whether some fillings are being placed unnecessarily. The evidence suggests this is not a fringe worry. A study evaluating the clinical decisions of final-year dental students found that for repairing a faulty restoration, nearly 88% of students proposed an approach that qualified as overtreatment, typically opting to remove and replace the entire filling rather than performing a more conservative repair.20PubMed Central. Overtreatment in Restorative Dentistry: Decision Making by Last-Year Dental Students Only about 59% correctly identified an early cavity on a molar’s chewing surface, and a majority wanted to run unnecessary diagnostic tests before deciding on treatment.
This tendency toward aggressive intervention is not limited to students. Different dentists can look at the same tooth and reach very different conclusions about whether it needs a filling. Some early-stage enamel lesions that could be remineralized with fluoride and monitored over time instead get drilled and filled. Once that filling is placed, the restorative cycle begins. There is growing recognition in the dental profession that a “watch and wait” approach to very early lesions, sometimes called minimal intervention dentistry, can prevent unnecessary fillings without compromising outcomes. If you are told you need a filling on a tooth that does not hurt and where the cavity is shallow, getting a second opinion is a legitimate move.
Dry Mouth, Medications, and Root Decay in Older Adults
Older adults face a distinct set of risks that can rapidly increase their filling count. Medications for blood pressure, depression, allergies, and many other conditions reduce saliva production, and saliva is one of the mouth’s main defenses against decay. A study of adults with dry mouth found that the rate of new cavities was substantial: out of nearly 700 new lesions diagnosed, about 64% were on the tooth crown and 36% were on exposed root surfaces.21PubMed. The effectiveness of 10% chlorhexidine varnish treatment on dental caries incidence in adults with dry mouth Root surfaces, exposed as gums recede with age, are softer than enamel and decay more easily. For someone over 65 taking multiple medications, it is entirely possible to go decades with stable dental health and then develop several new cavities in a short period.
Chlorhexidine varnish treatment showed a statistically significant reduction in root caries and total caries in that same study, suggesting that older adults with dry mouth can benefit from targeted preventive treatments beyond just brushing and flossing. If you are on medications that dry your mouth, asking your dentist about prescription-strength fluoride rinses, xylitol products, or saliva substitutes can slow the progression of new decay.
Fillings in Children’s Baby Teeth
Parents often wonder whether filling a baby tooth that is going to fall out anyway is worthwhile. Baby teeth hold space for permanent teeth, and untreated decay in primary molars can cause pain, infection, and crowding of the adult teeth coming in behind them. The question is less about whether to treat and more about how.
Cochrane reviews of filling materials for baby teeth have found remarkably thin evidence to guide the choice of material. One review comparing resin-modified glass ionomer, compomer, and amalgam in primary molars found no significant clinical differences between any of them over the study periods evaluated.22Cochrane Database of Systematic Reviews. Interventions for treating caries in the primary dentition Another Cochrane review looking at whether preformed metal crowns were superior to fillings for badly decayed primary molars could not find a single randomized controlled trial that met its inclusion criteria, leaving the question unanswered by high-quality evidence.23Cochrane Database of Systematic Reviews. Preformed metal crowns for managing decayed primary molar teeth in children A systematic review of aesthetic crowns for children found that zirconia crowns gave better short-term gingival health and fewer fractures than some alternatives, but follow-up was only six months, making long-term conclusions impossible.24PubMed. Aesthetic preformed paediatric crowns: systematic review
For children, the practical takeaway is that one or two fillings in baby teeth is common, and the specific material used probably matters less than catching the decay before it spreads. The more important question is whether your child’s cavity pattern suggests high caries risk that should be addressed with fluoride varnish, dietary changes, and sealants to protect the permanent teeth coming in.
Remineralization and the Possibility of Fewer Fillings in the Future
Research into materials that can repair enamel without drilling is advancing, though it has not yet changed everyday clinical practice in a big way. One promising avenue involves self-assembling peptides, small protein-like molecules that bind to damaged enamel and attract calcium to rebuild mineral structure. A peptide called P11-4 has been shown to help nucleate the formation of new hydroxyapatite crystals, which are the building blocks of enamel, potentially allowing very early lesions to be reversed rather than drilled.25PubMed Central. Next-Generation Strategies for Enamel Repair and Regeneration: Advances in Biomaterials and Translational Challenges Products based on this technology are in various stages of clinical testing. They will not replace fillings for cavities that have already broken through the enamel into the softer layer underneath, but they could shrink the pool of early-stage lesions that currently get filled.
Combined with the broader move toward minimal intervention dentistry, these developments suggest that the filling counts of future generations may continue the downward trend. For now, though, if you have a cavity that has penetrated beyond the enamel surface, a filling remains the standard and effective treatment. The best way to keep your personal count low is less glamorous than regenerative peptides: limit sugary snacks between meals, use fluoride toothpaste, and keep up with dental visits so that early lesions can be monitored rather than immediately drilled.