You are looking in the mirror, or maybe at a photo where you happened to be laughing, and you notice the dark shadows at the back of your smile. They have been there since you were nine years old and you never thought about them once. Now you do.
If you grew up in the Southern Tier in the seventies, eighties, or nineties, there is a good chance you carry several silver amalgam fillings. They were the standard of care for generations and many of them have done their job faithfully for decades. The question worth asking is not whether they are old, but whether they are still working.
This article covers what actually happens to amalgam fillings over time, what the current science says about their safety, when replacement is genuinely warranted, and when leaving a sound filling alone is the better decision. Our practice has been restoring teeth for local families since 1955, and we have replaced a great many of these while also advising plenty of patients to leave theirs be.
Amalgam is durable, which is why it lasted as the standard for so long. It is not permanent.
Metal expands and contracts with temperature. Every hot coffee and every bite of ice cream flexes the filling slightly against the tooth around it. Over decades of that cycling, two things tend to happen. The seal at the margin where filling meets tooth begins to break down, opening a microscopic gap. And the surrounding tooth structure, which is more brittle than the metal, develops stress fractures radiating outward.
That marginal gap is the real concern. Bacteria enter it and decay begins underneath the filling, hidden from view and often from a standard visual exam. Patients are frequently surprised to learn that a filling which looks perfectly fine has active decay beneath it. This is called recurrent decay, and by the time it produces symptoms it has usually spread further than a simple filling can address.
The cosmetic issue is the one patients notice first. Amalgam darkens with age and can leave a gray cast in the tooth structure around it, sometimes visible through the enamel on a premolar that shows when you smile broadly.
Patients ask about mercury, and it deserves a direct answer rather than a marketing one.
Dental amalgam contains mercury bound into an alloy with silver, tin, and copper. The U.S. Food and Drug Administration and the American Dental Association both consider amalgam fillings safe for the general adult population. In 2020 the FDA issued updated guidance recommending that certain higher-risk groups, including pregnant women, nursing mothers, children under six, and people with kidney impairment or a known mercury sensitivity, avoid receiving new amalgam fillings where an alternative is appropriate.
Importantly, the FDA does not recommend removing existing amalgam fillings that are intact and functioning. Removing a sound filling releases more mercury vapor than leaving it in place, and it removes healthy tooth structure that cannot be replaced.
The honest position is this. If your amalgam fillings are intact, sealed, and free of decay underneath, there is no health reason to replace them. If they are failing, cracked, leaking, or leaving you self-conscious about your smile, replacement is a reasonable decision made for reasons that have nothing to do with mercury.
Rather than a blanket answer, the decision comes down to what we can actually see and measure at your visit.
Two tools help us make this call with more confidence than a visual check alone. Our DIAGNOdent laser detection system identifies decay beneath and around existing restorations using a painless pulse of light. Our digital intraoral camera lets you see the same magnified image we are looking at, which turns an abstract recommendation into something you can evaluate for yourself. You can read more about the diagnostic technology in our Vestal office.
For most teeth, the answer is a bonded composite restoration. A tooth-colored filling is placed in layers, chemically bonded to the tooth rather than wedged into it, and shaped to the tooth's natural contour. Because it bonds, it typically requires removing less healthy tooth structure than the original amalgam preparation did.
Getting the shape right on a back tooth is more technical than it sounds. The contact point between adjacent molars has to be tight enough to keep food out and contoured correctly so floss passes cleanly. We use the Triodent sectional matrix system for this, which reproduces the natural curve of the tooth and produces a smooth, properly shaped finish rather than a flat one.
Some fillings have simply grown too large. Once a restoration occupies most of the chewing surface, the remaining walls of the tooth are thin enough that another filling would invite a fracture. In those cases a CEREC single-visit crown or onlay is the better answer, wrapping and supporting the tooth rather than filling a hole in it. Our CEREC Primemill system designs and mills the restoration in-office, and our Programat CS6 furnace stains and glazes it, so you leave with a permanent restoration the same day rather than a temporary and a second appointment. Our post comparing traditional crowns and one-day CEREC crowns explains the difference.
Patients who come in asking about their silver fillings are frequently thinking about more than the fillings. They have reached a point where the overall look of their smile is on their mind.
If that describes you, it is worth having the whole conversation at once rather than piecemeal. Replacing back fillings, addressing a chipped front edge with direct bonding, and considering professional teeth whitening are decisions that interact. Whitening, in particular, should come before new restorations are matched, since composite does not lighten the way natural enamel does and a shade matched to unwhitened teeth will stand out afterward.
Where several teeth need attention, a coordinated smile makeover plan produces a more cohesive result than treating each one as it fails. Our before and after gallery shows what that looks like in practice, and our post on why patients love natural white fillings covers the material itself in more detail.
The most valuable outcome here is an honest evaluation, and sometimes that evaluation is that your fillings are fine and you should keep them. We are not going to recommend replacing sound restorations, and we will tell you plainly which ones can wait and which ones cannot.
For the ones that do need attention, handling them before they fracture is meaningfully cheaper and less invasive than handling them afterward. A filling replaced on schedule is one appointment. A molar that splits on a Saturday becomes a dental emergency, and sometimes a root canal.
Patients throughout Vestal, Owego, and the Greater Binghamton region have trusted our team with this kind of straight assessment for seventy years. Call Vestal Dental Associates today at (607) 785-3339 or request an appointment online, and let us take a proper look at what those old fillings are actually doing.