Composite vs amalgam fillings — what to choose

The honest answer: both composite (tooth-coloured) and amalgam (silver) fillings can restore a decayed or broken tooth, and the right choice depends on where the tooth sits in your mouth, how large the cavity is, your bite, and your own preference. There is no single filling that suits everyone, which is why the decision is made with your dentist after examining the tooth and taking any X-rays that are needed.

What is the difference between composite and amalgam fillings?

A composite filling is made from a tooth-coloured resin that is bonded directly to the tooth and shaped to match the surrounding surface. Because it can be matched to your tooth shade, it is hard to see once it sets.

An amalgam filling is a silver-grey material that has been used in dentistry for well over a century. It is hard-wearing and was for a long time the standard choice for back teeth that take heavy chewing loads.

• Appearance: composite blends in; amalgam is visibly silver.
• Bonding: composite bonds to the tooth, so less healthy tooth usually needs to be removed; amalgam is held in place mechanically.
• Strength: both are durable; amalgam has a long track record on large back-tooth cavities.

When is a tooth-coloured composite filling a good choice?

Composite is often chosen for front teeth and visible areas where appearance matters, and for small to moderate cavities where bonding helps preserve healthy tooth structure. Many people now prefer composite simply because they would rather not have visible metal in their smile.

When might amalgam still be considered?

Amalgam may still be considered for some large cavities in back teeth that carry heavy chewing forces, or where keeping the area completely dry during placement is difficult. Whether it is suitable for your tooth is something to discuss at your appointment, rather than a fixed rule that applies to every patient.

Are amalgam fillings safe?

Amalgam has been studied extensively. National regulators, including in Australia, advise that existing amalgam fillings in good condition do not generally need to be removed simply because they are amalgam. If you have specific health questions, raise them with your dentist so the advice is tailored to you. There are situations where a dentist may recommend a different material, and that conversation is part of planning your care.

How long do fillings last?

The lifespan of any filling depends on the size of the original cavity, the tooth it is in, your bite, and how well you keep the area clean. No filling lasts forever; all fillings can eventually wear, chip, or leak at the edges and need replacing. Regular check-ups let your dentist spot a failing filling early, before it leads to bigger problems like decay underneath or a cracked tooth.

Does it hurt to get a filling?

Most fillings are placed comfortably using local anaesthetic to numb the tooth. You may feel pressure and vibration, but the procedure should not be painful. If you feel anxious about dental treatment, let the team know beforehand so they can pace the appointment and keep you comfortable.

How do I look after a new filling?

• Brush twice a day with fluoride toothpaste and clean between your teeth daily.
• Avoid biting very hard objects (ice, pens, nutshells) that can chip any filling.
• If a filling feels too high or your bite seems off after the anaesthetic wears off, contact the clinic so it can be adjusted.
• Keep up regular check-ups so the filling and the tooth around it can be monitored.

Frequently asked questions

Can I replace my old silver fillings with white ones?

In many cases an existing amalgam filling can be replaced with composite, often for appearance reasons. Whether replacement is advisable for a specific tooth depends on the condition of the existing filling and the tooth underneath, so it is assessed individually rather than as a blanket policy.

Are white fillings covered by my health fund?

Many extras policies contribute towards fillings, but the amount varies by fund, level of cover and item number. We will give you a written, itemised treatment plan before any work begins, and we recommend checking the rebate directly with your health fund so you know your own out-of-pocket figure.

Are children's fillings bulk-billed?

Eligible children may have dental treatment, including fillings, bulk-billed through the Medicare Child Dental Benefit Schedule (CDBS), meaning Medicare pays the clinic directly and there is no out-of-pocket cost for covered services. You can check eligibility on our CDBS page or with us.

How much does a filling cost?

The cost depends on the size and location of the cavity and the material used, so the only accurate figure is a written quote after an examination. You can see general information on our fees page and we will confirm the exact figure before starting.

Talk to a Sydney dentist about your filling options

If you have a sore tooth, a cavity, or an old filling you are unsure about, the best next step is an examination so the advice is specific to your tooth. Book online, call (02) 9649 6468, or click our WhatsApp to chat now: message Berala Dental on WhatsApp. For a painful or broken tooth, see our emergency dental page.

We review this article periodically so the information stays current for 2026.