What Replacing Old Fillings Costs

What it costs to replace an old filling

Replacing an old filling with a new composite (tooth-colored) filling commonly costs $150 to $600 per tooth, depending on how many surfaces of the tooth are involved and where the tooth sits in the mouth. Front tooth filling cost typically falls at the lower end of that range for a simple one-surface replacement; a larger, multi-surface replacement on a molar generally costs more because it takes longer to remove the old material and shape the new one precisely.

What a tooth-colored filling costs has become the more relevant comparison for most people today, since composite has largely replaced silver amalgam as the default material for a visible replacement, though a composite vs amalgam filling cost comparison still matters for a back tooth where either white or silver remains an option. If the dentist finds decay has spread underneath the old filling, or the remaining tooth structure is too thin to safely hold another filling, the plan changes to a crown, which typically runs $800 to $3,000 depending on the material chosen. That shift is common enough with older, larger fillings that it is worth asking upfront how likely it is before committing to a quote for a simple filling replacement.

Why old fillings need replacing

About 1 in 5 adults aged 20 to 64 has at least one untreated cavity at any given time 1Ref 1Centers for Disease Control and Prevention (2024).Cavity Facts.That about 1 in 5 (21%) adults aged 20-64 have at least one untreated cavity, supporting that cavities and worn fillings are common., and many more are living with fillings placed years or decades ago that are approaching the end of their useful life. A filling can wear down from years of chewing, its edge can develop a small gap where bacteria and food can get underneath, or the tooth around it can crack from the stress of biting, none of which is usually painful until the problem has progressed.

A routine dental exam and X-ray are how most old fillings are caught before they cause a bigger problem, which is part of why regular checkups matter even for a mouth that feels fine. A filling that looks intact on the surface can still have decay spreading beneath it, invisible without an X-ray.

Do old amalgam (silver) fillings need to be replaced?

Not automatically. The FDA does not recommend removing existing amalgam fillings that are intact and not causing a problem, and its 2020 guidance instead focuses on certain higher-risk groups, including pregnant or nursing women, women planning pregnancy, young children, and people with mercury sensitivity or certain neurological or kidney conditions, for whom a new amalgam filling may not be the best choice going forward 2Ref 2U.S. Food and Drug Administration (2020).Dental Amalgam Fillings.That the FDA recommends certain higher-risk groups avoid new dental amalgam when appropriate, while not recommending removal of intact existing amalgam fillings..

That guidance is about placing new amalgam in those groups, not about removing amalgam that is already there and working fine. Someone who wants an old amalgam filling replaced purely for appearance, rather than because of decay, a crack, or a specific health concern raised with a dentist, is making a cosmetic choice rather than following a safety recommendation.

When a filling replacement becomes a crown

Crowns strengthen a tooth that has a large filling, protect one that is weak or broken, or cover a tooth that is badly discolored or oddly shaped 3Ref 3American Dental Association (2024).Crowns.That crowns strengthen a tooth with a large filling, protect a weak or broken tooth, or cover a discolored or misshapen tooth.. A very old, very large filling, especially one that covers most of the chewing surface, leaves less natural tooth structure behind it than a smaller filling would, and that thinner remaining structure is more likely to crack under everyday biting force.

A dentist generally recommends a crown over another filling once that risk crosses a certain threshold, which depends on how much of the tooth the old filling already covers and whether a crack is visible or suspected. Getting a second opinion is reasonable when a routine filling replacement is unexpectedly quoted as a crown, since the difference in cost is substantial.

Whitening and an old filling's color

Teeth whitening lightens natural enamel but does not change the color of an existing filling, crown, or veneer 4Ref 4American Dental Association (2024).Teeth Whitening.That whitening lightens natural enamel but does not work on crowns, veneers, or fillings already in the mouth., which is why an old filling that once matched can start to look darker or more visible after the surrounding teeth are whitened. Replacing that filling with a new, better-matched composite is the only way to fix the mismatch; whitening the filling itself is not an option.

Anyone planning to whiten and who also has visible old fillings on front teeth may want to whiten first, then have any mismatched fillings replaced to match the new, lighter shade, rather than replacing them first and whitening around a color that is about to change.

Does insurance cover replacing an old filling?

Most dental PPO and DHMO plans cover filling replacement at the same percentage as a first-time filling when there is a documented clinical reason, such as decay or a crack, though some plans pay less for a composite filling on a back tooth than for the amalgam alternative, treating the difference as the patient's responsibility. A discount or membership plan instead gives access to a reduced fee rather than paying a claim 5Ref 5American Dental Association (2024).Types of Dental Plans.The distinction between dental PPO/DHMO insurance and a discount or membership plan that gives access to reduced fees rather than paying claims..

A purely cosmetic replacement, done only to match a whitened smile or to remove a visible silver filling with no clinical problem, is less likely to be covered and is usually billed as an out-of-pocket cosmetic procedure. Cost remains the top barrier to dental care nationally 6Ref 6American Dental Association, Health Policy Institute (2024).Coverage, Access & Outcomes.That cost is the top barrier to dental care in the United States relative to other health services., which is part of why confirming coverage before scheduling a filling replacement is worth the phone call.

It is also fair to ask how many visits the plan will take, since most filling replacements are completed in a single appointment, and to confirm whether the quote already accounts for the possibility that removing the old filling reveals more decay than expected. A dentist willing to walk through what happens if the plan changes mid-procedure, rather than leaving that as a surprise on the final bill, is generally being transparent about a genuinely unpredictable part of this work.