Compare tooth-colored composite resin with silver-colored dental amalgam by appearance, durability, cavity size, moisture control, tooth preparation, cost, insurance and current FDA guidance. The best filling is the one that fits the specific tooth and patient—not simply the material with the lowest price or best cosmetics.
A tooth-colored resin material containing a resin matrix and glass or quartz-type filler. Composite is selected when natural appearance and adhesive bonding are important, and it is widely used on both front and back teeth.
A silver-colored mixture of metals that includes elemental mercury combined with an alloy containing silver, tin and copper. It has a long history of use and remains known for strength, durability and relatively simple placement.
Both materials replace tooth structure lost to decay, but they behave differently during placement. This simplified visual is not a clinical cross-section; it shows the main material difference patients notice.
Composite is placed in a prepared cavity and bonded to tooth structure. Shade matching helps it blend with the surrounding tooth.
Amalgam is packed into the prepared cavity and hardens into a durable metal restoration. Its color remains visibly different from enamel.
Composite usually wins for appearance and adhesive tooth-colored restoration. Amalgam can still be useful when durability, cost, a larger posterior cavity or difficult moisture control are major factors. The ADA emphasizes individualized material selection based on cavity size and location, cosmetics, longevity, insurance and out-of-pocket cost.
There is no universal winner. A small visible cavity in a front tooth creates a very different decision from a deep or wide cavity in a heavily loaded molar.
Designed to blend with natural tooth color.
May be easier to place where isolation is difficult.
National planning references generally show lower fees.
Tooth, cavity, bite, health history and preferences matter.
Use this table as a decision overview, not a prescription. Actual performance depends on the tooth, cavity design, bite, placement quality and ongoing oral health.
| Factor | Composite Filling | Amalgam Filling |
|---|---|---|
| Color | Tooth-colored; shade can be matched to surrounding enamel. | Silver/gray and usually visible. |
| Material | Resin matrix with glass or quartz-type filler. | Mercury combined with a metal alloy containing silver, tin and copper. |
| Where used | Front or back teeth; commonly chosen when cosmetics matter. | Often considered for larger posterior cavities or areas with strong chewing forces. |
| Moisture control | A clean, dry field is important for predictable bonding. | Placement is less dependent on adhesive bonding and may be useful when isolation is harder. |
| Placement time | Usually takes longer because of isolation, bonding and incremental curing steps. | Often quicker to place. |
| Tooth preparation | Bonding may allow a more conservative preparation in suitable cases. | Mechanical retention can require removal of additional tooth structure depending on cavity design. |
| Durability | Good durability for many small- to mid-size restorations; outcome is technique and case dependent. | Long record of durability, including high-load posterior use. |
| Published U.S. average | About $226; reported range $173–$439. | About $139; reported range $108–$256. |
| Insurance | Some plans may apply an alternate benefit on certain posterior teeth. | May be used by some plans as the lower-cost comparison allowance. |
| Health guidance | Non-amalgam option often considered when amalgam is not preferred or appropriate. | FDA recommends certain higher-risk groups avoid new amalgam when possible and appropriate. |
A composite filling is a direct, tooth-colored restoration. ADA patient guidance describes composite resins as a mixture of glass or quartz filler that can provide good durability and fracture resistance for small- to mid-size fillings exposed to moderate chewing pressure. Composite can be used on front and back teeth.
The dentist selects a shade intended to blend with the surrounding tooth, making composite especially useful in visible areas.
Composite is bonded to tooth structure with an adhesive system. That bonding process is one reason moisture control matters during placement.
Many composites are placed in increments and hardened with a curing light before final shaping, bite adjustment and polishing.
Read the ADA's tooth-colored filling guidance for more patient-focused information.
Dental amalgam is a direct silver-colored filling material. The FDA describes it as a mixture containing liquid elemental mercury and a powdered alloy composed primarily of silver, tin and copper. Roughly half of the material by weight is elemental mercury, which binds the alloy particles into a solid restoration.
ADA guidance highlights amalgam's durability and its usefulness for larger cavities and heavily loaded back teeth.
Amalgam generally requires fewer adhesive steps than composite and can be practical when a patient cannot stay still for a long procedure.
The silver-gray color does not match enamel, which is the main cosmetic disadvantage for many patients.
See the ADA's dental amalgam overview and the FDA's current dental amalgam information.
Composite fillings are generally more expensive than amalgam fillings in published U.S. cost comparisons. One national planning reference from CareCredit reports the following averages and broad price ranges before considering your specific insurance benefits.
These are U.S. planning references, not fee guarantees. Actual price varies by tooth, surfaces restored, cavity size, geography, provider, additional procedures and insurance.
Want a personalized budget? Use the Dental Filling Cost Calculator to compare material estimates, number of fillings and simplified insurance assumptions.
Published price reference: CareCredit dental filling cost guide.
Amalgam has a long reputation for durability, especially in high-load posterior teeth. Composite materials have improved substantially and are routinely used on back teeth, but no material's lifespan can be predicted from its name alone.
NIDCR notes that fillings and crowns generally do not last a lifetime and may eventually need replacement. That is why an old restoration should be monitored rather than assumed to be permanent.
Composite is an adhesive restoration. The tooth surface is conditioned and a bonding system is used before the resin is placed and cured. Saliva, blood or other contamination can interfere with adhesion, so the dentist typically isolates the tooth with suction, cotton rolls, retraction or a rubber dam depending on the situation.
If a cavity extends below the gumline or the tooth is difficult to isolate, the dentist may need to modify the technique or consider a material that is more forgiving in that environment. This is one reason a material that looks better cosmetically is not automatically the best material for every cavity.
Composite's adhesive bonding can allow conservative cavity preparation in many cases because the restoration does not rely only on mechanical undercuts for retention. ADA patient information on amalgam notes that more tooth structure may need to be removed to prepare some teeth for amalgam than for other materials.
However, the amount of drilling is driven primarily by the decay, cracks, old restoration and what is required to create a stable restoration. A dentist should not leave diseased or unsupported tooth structure simply to make the preparation smaller.
Composite is usually the more natural-looking choice when a filling is visible in the smile. It can be shade matched and polished so the restoration blends with the tooth. Amalgam's silver-gray color is much more obvious on front teeth.
Appearance is not the only issue. Front-tooth restorations may involve edges, fractures or biting surfaces where the dentist must consider how much natural tooth remains and whether a direct composite, veneer, crown or another restoration is more predictable.
Both materials can be used in posterior teeth, but the decision becomes more dependent on cavity size, moisture control and chewing load. ADA patient guidance describes composite as suitable for many small- to mid-size restorations and amalgam as durable and useful for larger cavities or back teeth that receive significant chewing force.
Composite is commonly chosen when isolation is good and preserving a natural tooth color is important.
Amalgam may still be considered for strength and ease of placement, but a very weakened tooth may need an onlay or crown instead of either direct filling.
Moisture control can be challenging. The dentist must judge whether adhesive bonding can be performed predictably.
The FDA states that the majority of evidence does not show mercury exposure from dental amalgam causes negative health effects in the general population. However, it identifies groups who may be more susceptible to potential adverse effects from mercury exposure.
FDA higher-risk groups: pregnant women and developing fetuses; women planning pregnancy; nursing women and their infants; children, especially under age six; people with pre-existing neurological disease; people with impaired kidney function; and people with known heightened sensitivity or allergy to mercury or other amalgam components.
For these groups, the FDA strongly encourages the use of non-amalgam restorations such as composite resin or glass ionomer when possible and appropriate for the tooth. The FDA also says it does not recommend removing or replacing intact amalgam fillings in good condition unless a health care professional considers removal medically necessary.
See the FDA dental amalgam recommendations for the complete current wording.
Not automatically. Replacing a filling requires removing the old restoration and usually some additional tooth structure. If an amalgam filling is intact, functional and free of recurrent decay, replacing it only because it is old or silver-colored may not provide a clinical benefit.
The dentist looks for cracks, recurrent decay, open margins, fracture, pain or wear.
The remaining cusps, bite and pulp health determine whether another filling is still enough.
If replacement is necessary, the dentist chooses composite, amalgam, an onlay, crown or another restoration based on the new situation.
The FDA specifically advises against removing intact amalgam solely to prevent disease unless removal is medically necessary. Removal can temporarily increase mercury vapor exposure and sacrifice healthy tooth structure.
Dental insurance can change the apparent price difference between materials. A plan may list fillings as a covered restorative service but still apply a deductible, annual maximum, network allowance, frequency rule or alternate benefit.
Some dental plans may reimburse a posterior tooth-colored composite only up to the amount the plan would have allowed for a lower-cost material. If the dentist charges more for composite, the patient may be responsible for the difference in addition to normal coinsurance.
Before treatment, ask: “What is my estimated benefit for this exact tooth and number of surfaces, and does my plan apply an alternate benefit if I choose composite?”
A material choice should be made after the dentist has examined the tooth. The following questions matter more than simply asking which material is “stronger.”
Front vs back tooth, above vs below the gumline, and visible vs hidden surfaces all change the priorities.
A small filling and a wide cavity involving weakened cusps are different restorative problems.
Predictable composite bonding depends on good isolation from saliva and contamination.
Grinding, clenching and posterior chewing loads can influence restoration design and material choice.
Appearance, budget, insurance, appointment time and material preferences are legitimate considerations.
If too much tooth is missing, an onlay or crown may protect the tooth more predictably than a very large direct filling.
A cavity can become too large for a direct restoration to reliably support the remaining tooth. If one or more cusps are fractured, a large old filling has failed, or the tooth has lost substantial structure, the dentist may recommend an onlay or crown instead of placing another large filling.
For budgeting, compare the next treatment level with our Dental Crown Cost guide or the Dental Crown Cost Calculator.
If a restoration is lost before you can be seen, a temporary dental filling may sometimes protect the area briefly, but it is not a substitute for diagnosis or definitive treatment.
This guide separates patient-education guidance from published price references. Clinical statements are based on U.S. government and American Dental Association patient resources; cost figures are planning references rather than local fee guarantees.
Dental Fillings — cavity treatment basics, filling materials and replacement context.
Dental Filling Options — material selection, composite and amalgam characteristics, appearance and durability considerations.
Dental Amalgam Fillings — composition, higher-risk populations and recommendations concerning new and existing amalgam restorations.
Dental Filling Cost Guide — national composite and amalgam planning ranges used for the cost comparison.
Educational use only: This page cannot diagnose a cavity or determine which filling material is appropriate for you. A dentist must examine the tooth and review your health history before recommending treatment.
Common questions about strength, cost, safety, replacement, insurance and choosing a filling material.
Neither material is automatically better for every tooth. Composite is tooth-colored and bonds to the tooth but needs good moisture control. Amalgam is durable, less expensive in many published cost comparisons and can be useful where keeping the tooth dry is difficult. Your dentist should consider cavity size and location, bite forces, appearance, health history, remaining tooth structure and your preferences.
Longevity varies with cavity size, tooth position, bite forces, placement quality, oral hygiene and other factors. ADA patient guidance describes amalgam as very durable and notes that some studies find composite fillings may need replacement more often. No filling material lasts forever.
Both materials have clinical uses, but the FDA identifies certain groups who may be more susceptible to potential effects from mercury exposure and recommends avoiding new amalgam when possible and appropriate for those groups. Discuss your personal health history and available materials with your dentist.
The FDA does not recommend removing intact amalgam fillings in good condition solely to prevent disease unless removal is medically necessary. Removal can sacrifice healthy tooth structure and temporarily increase mercury vapor exposure. A dentist should first check the filling for decay, fracture, leakage or other clinical reasons for replacement.
Published U.S. cost references generally place composite above amalgam. CareCredit reports a national average around $226 for composite and $139 for amalgam, with broad ranges that vary by tooth, cavity size, location and provider. Your dentist's quote and insurance plan are more relevant to your final cost.
Many plans cover composite restorations, but some plans may apply an alternate benefit or reimburse only up to the amount allowed for a lower-cost filling material on certain posterior teeth. Check your plan document or ask the insurer how the specific tooth and surfaces are covered.
Composite relies on an adhesive bonding process. Saliva or other contamination can interfere with bonding, so dentists typically isolate the tooth and keep the working area clean and dry during placement.
Amalgam can technically be used in different teeth, but its silver color makes it more visible. ADA patient guidance notes it may be useful for larger cavities in back teeth and in areas that are difficult to keep dry.
Sometimes, but a direct filling is not appropriate for every large defect. The amount of remaining tooth structure, cusp involvement, bite forces and cavity location matter. A dentist may recommend an onlay or crown when a tooth is too weakened for a predictable direct filling.
Often, yes. NIDCR notes that dental fillings and crowns generally do not last a lifetime. Replacement should be based on clinical findings such as recurrent decay, fracture, wear, poor margins or symptoms—not simply the age of the restoration.
If your dentist says more than one filling material is clinically appropriate, compare the actual quoted fee, your insurance allowance and your out-of-pocket amount—not just the national average.