When Should a Dental Filling Be Replaced?

Most fillings last somewhere between 5 and 15+ years, depending mainly on the material they’re made from¹. But age on its own isn’t the real signal to watch for. A filling gets replaced when it’s actually showing signs of failure, cracks, leaking, decay creeping back in, ongoing sensitivity, not simply because it’s reached a certain birthday. A filling that’s old but behaving perfectly well can often be left exactly where it is.

These are averages, not guarantees¹. Some fillings fail early, others quietly outlast their expected range by years, and your dentist checking them at routine visits is the only reliable way to know how yours is actually doing.

A handful of factors do most of the work here. The material itself matters most, as the table above shows, but where the filling sits in your mouth matters almost as much: back teeth take far more chewing force than front ones, so molar fillings tend to wear out sooner than a filling on a front tooth doing the same job for the same number of years. 

Oral hygiene plays its part too, since fresh tooth decay can sneak in around the edges of an otherwise sound filling if brushing and flossing slip. Grinding your teeth at night accelerates wear on almost any material, and larger fillings, simply by covering more surface area, tend to have a shorter working life than small ones.

Watch for any of the following:

• Pain or sensitivity, especially to hot, cold, or pressure, that wasn’t there before
• A visible crack or chip in the filling itself
• The filling feels rough, uneven, or has partly come loose
• A dark line or stain forming around the edge of the filling (a sign it may be leaking)
• New decay developing around or underneath the filling
• Food consistently getting trapped in the same spot

Any one of these is worth a dental check-up, even if it isn’t painful yet.

It’s tempting to assume an older filling automatically needs swapping out, but that’s not how dentists actually approach it, and for good reason. 

Every time a filling is replaced, a little more of the tooth’s healthy structure gets removed along with the old material to make room for the new one. Replace a filling unnecessarily enough times, and eventually there isn’t enough natural tooth left to support a filling at all, which is when a crown, or something more involved, becomes the only option. 

A well-placed filling that’s still sealing properly and causing no problems is usually best left alone, age notwithstanding.

It’s usually less of an ordeal than people expect — normally a single visit. The dentist examines the tooth, often taking an X-ray first to see what’s happening underneath, then numbs the area with local anaesthetic. The old filling and any decay hidden beneath it are removed, the tooth is cleaned and lightly reshaped, and a new filling is placed and set. A quick bite check and minor adjustment make sure it feels natural when you chew.

Sometimes a tooth has lost too much structure for a straightforward filling to do the job properly, whether from a large original cavity or several rounds of replacement over the years. In these cases, an inlay or onlay, or a full crown, may be the more sensible recommendation, since they cover and protect more of the tooth than a filling alone can.

This is also where amalgam fillings often come up specifically. Many patients with older silver fillings choose to switch to tooth-coloured composite once a replacement is needed anyway, mainly for appearance. Worth being clear on the evidence: the FDA considers dental amalgam safe for the general population and does not recommend removing fillings that are still in good condition purely over mercury concerns². Higher-risk groups, such as those pregnant or planning to be, may want to discuss alternatives with their dentist, but that’s a conversation about future fillings, not a reason to worry about old ones already in place. Removing amalgam fillings is a routine procedure when it’s genuinely needed.

Cost depends mainly on the material chosen and the size and location of the filling, with composite generally costing more than amalgam, and gold or ceramic inlays costing more still. In the UK, private filling replacement pricing varies a fair amount between practices for these same reasons, which is part of why UK patients increasingly travel to Istanbul for routine restorative work like this: specialist-led care and modern materials, at pricing that reflects local costs rather than a difference in quality.

At DentSpa, our restorative dentists use modern tooth-coloured materials as standard and assess each tooth with proper imaging before recommending a replacement, rather than defaulting to the same approach for every patient. DentSpa was named Best Dental Odontology Clinic in Europe 2024, recognised specifically for digital dentistry and consistently strong patient outcomes, with a dedicated medical advisor team and after-care department supporting every patient’s visit. If you’re weighing up treatment in Istanbul, the clearest next step is a free consultation, where one of our dentists can look at your X-rays and tell you honestly whether your filling needs replacing at all.

If you’re unsure whether an old filling needs attention, the clearest next step is a free, no-obligation consultation. Send your X-rays to our team on WhatsApp, and one of DentSpa’s dentists will give you an honest answer.