Composite vs. Amalgam Fillings: Which Should You Choose?

The Quick Answer

For the majority of cavities we treat in Barrhaven — and especially any tooth that shows when you smile — modern composite resin is the recommended choice. It looks natural, bonds directly to the tooth, and lets us remove less healthy structure. Amalgam still has a place: it is durable, forgiving in hard-to-keep-dry areas, and budget friendly, which is why it served patients well for over a century. But for most people today, the balance tips toward tooth-coloured fillings.

That said, the right answer is genuinely tooth-by-tooth. Let's look at how the two materials really compare.

Composite vs. Amalgam at a Glance

Here's how the two materials stack up across the factors patients ask about most:

Composite Fillings in Depth

Composite resin is a blend of plastic and fine glass particles that your dentist places in layers and hardens with a curing light. Its biggest advantages are aesthetics and conservation. Because it is shade-matched and bonded, a composite filling restores the tooth almost invisibly while sealing it against further decay.

Where composite shines

Front teeth and any visible surfaces are ideal candidates, as are small to medium cavities throughout the mouth. The adhesive bond also means we can be more conservative — preserving more of your natural tooth keeps it stronger over the long term. You can read more on our composite fillings and white fillings pages.

What to keep in mind

Composite does ask a little more of the dentist. It must be placed in a clean, dry field and built up in careful layers, each cured with a light before the next is added — which is part of why the appointment can take a touch longer than amalgam. The payoff is a bonded, sealed, natural-looking restoration. Very large composite fillings on heavily-loaded back teeth can wear or stain over many years, which is when an inlay, onlay or crown may be a more durable long-term choice. For the everyday small and medium cavities most people get, though, composite is hard to beat.

Amalgam Fillings in Depth

Dental amalgam is an alloy of silver, tin, copper and mercury that has been used for more than 150 years. It is strong, wear-resistant and relatively inexpensive, and it tolerates moisture during placement better than composite — which can make it useful for cavities far back in the mouth that are difficult to keep perfectly dry.

The trade-offs

The obvious one is appearance: amalgam is dark and clearly visible. It also does not bond to the tooth, so the cavity sometimes has to be shaped to mechanically lock the filling in, which can mean removing slightly more healthy structure. Over many years, large metal fillings can also contribute to cracks as the tooth flexes. Many patients eventually choose to replace old silver fillings with composite for these reasons.

It is worth being clear-eyed rather than alarmist about amalgam. Millions of these fillings are still doing their job perfectly well, and there is no need to rush out and replace a sound, comfortable silver filling simply because it is metal. The case for switching is strongest when a filling is already failing, leaking or cracked, or when you would prefer a tooth-coloured result you can feel confident about. When that time comes, replacing amalgam with bonded composite is a straightforward procedure that also lets us check the tooth underneath for any hidden decay.

Is Amalgam Safe?

This is one of the most common questions we hear, and it deserves a straight answer. The mercury in amalgam is chemically bound within a stable alloy, and major health authorities — including Health Canada and the Canadian Dental Association — consider amalgam a safe and effective filling material for most people. There is no need to rush out and replace healthy, intact amalgam fillings purely over safety concerns.

Health Canada does advise caution in a few specific groups (for example, suggesting alternatives where practical during pregnancy or for very young children), which is part of why composite has become the default for so many patients.

Common Filling Myths

A lot of misinformation surrounds dental fillings, and it can lead people to make decisions they later regret — or to avoid treatment altogether. Let's clear up a few of the most common myths we hear from patients in Barrhaven.

"White fillings don't last as long as silver."

This was once true of early composite materials, but modern resins are dramatically improved. Placed correctly and cared for at home, today's composite fillings routinely last many years on the chewing surfaces most cavities affect. Longevity depends far more on the size of the filling, your bite and your oral hygiene than on the colour of the material.

"I should replace all my silver fillings right away."

Not so. Intact, well-functioning amalgam fillings generally do not need to be removed for health reasons. Unnecessary removal actually means drilling out healthy tooth structure. We only recommend replacing silver fillings when there is a genuine reason — wear, cracks, decay underneath, or your own preference for a tooth-coloured result.

"Fillings are painful."

With modern local anaesthetic, the procedure is comfortable — you feel pressure, not pain. If dental anxiety is what is holding you back, ask us about gentle techniques and sedation options.

Caring for Your Fillings

Whichever material you choose, how you care for your teeth afterward has the biggest impact on how long your filling lasts. The good news is that the routine is the same one that keeps the rest of your smile healthy — no special products required.

• Brush twice daily with fluoride toothpaste and floss once a day to prevent new decay around the filling.
• Keep up with regular checkups and cleanings so we can spot wear or leakage early.
• Avoid using your teeth as tools (opening packages, biting nails) which can chip any restoration.
• Wear a nightguard if you grind or clench — this is one of the biggest causes of premature filling failure.
• Limit very hard or sticky foods on freshly placed fillings, and cut back on frequent sugary snacking.

With this simple care, both composite and amalgam fillings can protect your tooth for many years. If a filling ever feels rough, sensitive or cracked, don't wait — a quick repair is far easier than dealing with new decay underneath. Our guide to what to expect from a filling covers aftercare in more detail.

Which Lasts Longer?

Longevity is one of the most common deciding factors, so it deserves an honest answer. Historically, amalgam had a reputation for outlasting composite, and for very large fillings on heavily-loaded back teeth that can still be true. But modern composite materials have improved enormously, and for the small to medium cavities most people have, a well-placed composite filling routinely lasts 7 to 10 years or more — comparable to amalgam in everyday use.

The bigger truth is that the material matters less than how the filling is placed and how it is cared for. A composite filling placed carefully in a clean, dry field, then maintained with good brushing, flossing and regular checkups, will comfortably outlast a rushed filling of any material. Habits like grinding or clenching shorten the life of every restoration, which is why we sometimes recommend a nightguard to protect both your teeth and your fillings. In other words, the decision between composite and amalgam rarely comes down to durability alone — for most teeth, both can last many years when looked after well.

One last point on longevity: no filling, regardless of material, lasts forever, and that is perfectly normal. Teeth flex thousands of times a day under the forces of chewing, and over the years the seal between any filling and the tooth can gradually wear. The goal is not to find a filling that never needs replacing, but to keep an eye on the ones you have so that when the time comes, replacement is a small, planned procedure rather than an emergency. This is exactly what routine checkups are for — and it is why the relationship with your dentist often matters more to the long-term result than the choice of material itself.

How to Choose the Right Filling

The best choice comes down to a few practical questions we will walk through together:

• Is the tooth visible? If it shows when you smile or talk, composite is almost always the better call.
• How large is the cavity? Small to medium cavities are ideal for composite; very large ones may be better served by an inlay, onlay or crown.
• What are your priorities? If a mercury-free, natural-looking result matters to you, composite delivers it.
• What does your budget allow? We will explain the costs of each and offer financing options so cost is never a barrier to good care.

As your experienced dental team in Ottawa, our job is to give you clear information and a recommendation we would make for our own families — then let you decide. To see how materials fit into the bigger picture, read our complete guide to dental fillings, or call (343) 313-1531 to book a consultation at our Barrhaven clinic.