If you grew up with a mouth full of silver fillings, you might still think of the choice between silver and white as a genuine toss-up, weighing durability against appearance. For most patients today, that’s not really how the decision plays out anymore. The amalgam vs composite fillings conversation has shifted, and it’s worth understanding why before you assume you’re picking between two equally common options at your next visit.

Where Things Stand Today

Composite, the tooth-coloured option, has become the default material for most fillings in New Zealand, not because amalgam suddenly became unsafe, but because composite technology improved to the point where it can handle most of what amalgam used to be relied on for.

• Composite bonds directly to the tooth, which generally means less healthy tooth structure needs to be removed to place it
• Modern composite materials have improved enough to be used confidently in back teeth, not just visible front teeth
• Amalgam is still used in some cases, particularly where durability in a hard-to-reach area matters more than appearance

None of this means amalgam has disappeared or is considered a lesser option when it’s still appropriate. It means the two materials are used for somewhat different reasons than they were a couple of decades ago, which is why the “debate” feels less relevant than it used to.

Why the Shift Happened

Amalgam earned its long history for good reason. It’s a durable, affordable material that holds up well under the pressure of chewing, particularly in molars. Composite, in its early years, wore down faster and wasn’t always suited to larger fillings in back teeth.

Dentists also had practical reasons to favour amalgam for decades beyond its strength:

• It was quicker to place, with a simpler process than composite’s layering and curing steps
• It was less sensitive to moisture during the procedure, which matters in hard-to-reach back teeth
• It was widely available and affordable, making it a practical default for routine decay

Those practical advantages mattered more when composite materials were less advanced than they are now.

What Changed Over Time

As composite materials and bonding techniques improved, they became viable for a much wider range of cavities, including ones that would once have automatically gone to amalgam. Better bonding agents, stronger resin formulations, and refined placement techniques all played a part. This shift happened gradually rather than all at once, which is part of why the idea of a big ongoing “debate” has stuck around in public perception longer than it’s been accurate in most dental clinics.

Is Amalgam Unsafe?

This is usually the real question underneath the silver-versus-white conversation, and it’s worth addressing directly rather than dancing around it. According to Medsafe, part of New Zealand’s Ministry of Health, dental amalgam has been used for many years without convincing evidence of adverse health effects for most people, aside from rare cases of contact hypersensitivity. Amalgam remains considered an important, useful filling material where it’s clinically appropriate, even as its overall use has decreased.

That’s different from saying amalgam is now considered outdated or unsafe. It’s more accurate to say composite has simply become practical and durable enough to be the more common everyday choice, while amalgam is still used in certain situations where its particular strengths matter more.

Please note that suitability for any filling material depends on individual circumstances, including the size and location of the cavity. This information is general and isn’t a substitute for advice from your dentist.

When Amalgam Might Still Be the Better Fit

There are still situations where a dentist may recommend amalgam over composite, and it’s not simply a matter of cost.

• Very large cavities in back molars, where the extra durability of amalgam can be an advantage
• Areas that are difficult to keep completely dry during the filling process, since composite bonding is more sensitive to moisture
• Cases where a patient has specific concerns about composite’s longevity in a particular spot in their mouth

These situations come up more often in molars than anywhere else in the mouth, partly because molars do the heaviest work when chewing and partly because moisture control is naturally trickier further back. A dentist weighing this up isn’t defaulting to an older material out of habit, they’re matching the material to what the specific tooth needs to hold up over time.

Your dentist can talk you through the trade-offs for your specific tooth during a comprehensive examination, rather than defaulting to one material across the board. Treatment suitability depends on individual circumstances, and what’s right for one tooth in your mouth may not be right for another.

What Patients Tend to Notice Day to Day

Beyond the underlying safety and durability questions, there are a few practical differences that show up more in everyday life than in the debate itself.

• Composite is matched to your natural tooth colour, so it’s generally not something you or others would notice when you talk, eat or smile
• Amalgam darkens slightly over time and is more visible, particularly if placed anywhere near the front of your mouth
• Metal fillings can transmit hot and cold more noticeably than composite, which some patients find uncomfortable with very hot drinks or cold food
• Longevity varies between the two, though the gap has narrowed as composite materials have improved

None of these differences is a safety concern on its own. They’re more about comfort and appearance, and worth mentioning to your dentist if any of them affect how you feel about an existing filling. How long any filling lasts still comes down to factors like your bite, your oral hygiene habits, and how large the original cavity was, not just the material itself.

What About Replacing Existing Amalgam Fillings?

If you have old amalgam fillings and no issues with them, there generally isn’t a health-driven reason to replace them. Some patients still choose to, and a few situations come up more than others:

• Appearance, particularly if the filling is visible when smiling, which is more of a cosmetic consideration than a necessity
• Visible cracking or wear on the existing filling, which is worth assessing regardless of the material
• A feeling of looseness or new sensitivity around the tooth

These are worth mentioning at a check-up regardless of what the filling is made from, since results and recommendations vary between individuals depending on the specific tooth involved.

General information on accessing dental care in New Zealand is available through Health New Zealand if you’re weighing up when to book your next check-up.

Frequently Asked Questions

Is Composite Always Better Than Amalgam?

Not necessarily. Composite suits most everyday fillings well, but amalgam can still be a suitable choice in specific situations, such as very large cavities in molars. Your dentist can advise what’s appropriate for your particular tooth.

Should I Get My Old Amalgam Fillings Removed?

Not unless they’re causing a specific problem, such as cracking or sensitivity. Removing well-functioning amalgam fillings without a clinical reason isn’t generally recommended, though appearance-based replacement is a personal choice some patients make.

Does a White Filling Cost More Than a Silver One?

Generally yes, since composite involves a more detailed placement process. Costs vary depending on the size and location of the filling, and your dentist can give you an accurate estimate for your specific situation.

Can I Choose Which Filling Material I Get?

In many cases, yes, though your dentist will advise if one material is clearly more suitable for a particular cavity. Suitability depends on factors like the size, location and depth of the decay.

Is It True That Some Countries Have Restricted Amalgam Use?

Some countries have introduced restrictions on amalgam, largely related to broader environmental concerns around mercury rather than confirmed harm to individual patients. New Zealand’s Ministry of Health continues to monitor the international evidence, and current guidance doesn’t recommend routine removal of well-functioning amalgam fillings.

Wondering Which Filling Material Suits Your Situation?

If you’re due for a filling, or you’re curious about the fillings you already have, it’s worth having a proper conversation rather than assuming one material is automatically the right choice. The team at Flash Dental in Mount Eden can talk you through what’s suitable for your specific tooth, based on your actual dental history rather than a general rule of thumb. You can request an appointment online to get started.