What are composite white fillings?

A composite white filling is a tooth-coloured restoration used to repair a tooth affected by decay, a small crack, chipping or wear. It is made from composite resin — a durable dental material that blends fine glass or ceramic particles with a resin base. Because it comes in a range of shades, your dentist can closely match it to the natural colour of your tooth, so the finished filling is generally difficult to notice.

You may hear composite white fillings called several things — white fillings, tooth-coloured fillings, composite resin fillings or simply composite fillings. These all refer to the same type of restoration. They differ from traditional amalgam (“silver”) fillings, which are made from a mix of metals including mercury and are visible against the tooth.

Composite resin is also used for some cosmetic purposes, such as reshaping a tooth or repairing a chipped edge, as part of what is often called composite bonding within cosmetic dentistry.

How do composite fillings work?

A key feature of a composite filling is that the resin bonds directly to your tooth. After the decayed part of the tooth is removed and the surface is prepared, the composite is applied in thin layers. Each layer is hardened (“cured”) with a specialised curing light before the next is added.

This layer-by-layer approach lets your dentist build the filling up gradually and shape it to match your tooth and bite. Once the final layer is set, the filling is trimmed, adjusted and polished — for a smooth feel and to help it resist staining and wear over time.

Because composite bonds to the tooth, the dentist usually only needs to remove the decayed or damaged portion. This is often a more conservative approach than amalgam, which historically required removing some additional healthy tooth structure to hold the metal in place.

The benefits of composite white fillings

Composite white fillings are widely used for several reasons:

• Natural appearance. Shade-matched resin blends with the tooth, so the repair is usually discreet.
• A generally conservative repair. Because composite bonds to the tooth, more healthy tooth structure can often be preserved compared with amalgam.
• Mercury-free. Composite contains no mercury, which many patients prefer and which aligns with the global move away from amalgam.
• Versatile. The same material can repair decay, rebuild a chipped edge or reshape a tooth.
• Often completed in one visit. Many straightforward composite fillings are placed in a single appointment.
• A bonded seal. A well-placed composite forms a close seal with the tooth at its margins.

It is worth being realistic: composite is not automatically the best choice in every situation. Suitability depends on the size and location of the cavity and your individual bite, which is why a dentist assesses your tooth before recommending a material.

Who are composite fillings suitable for?

Composite white fillings may suit a range of situations, including:

• Small to moderate cavities on front or back teeth
• Repairing chipped, cracked or worn teeth
• Replacing older or failing amalgam fillings for cosmetic or clinical reasons
• Minor reshaping of teeth as part of cosmetic bonding
• Patients who prefer a mercury-free, tooth-coloured option

They may be less suitable for very large cavities or areas under heavy chewing load, where a stronger restoration such as an inlay, onlay or crown can be more durable. Your dentist will also consider factors such as teeth grinding (bruxism) and oral hygiene. The only way to know what suits your tooth is a clinical examination, often with an X-ray.

What happens during a composite filling procedure?

The procedure is routine, and most people find it straightforward.

Before your appointment

Cavities are often found during a routine check-up and clean before they cause symptoms. If you have noticed toothache, sensitivity to hot or cold, or a visible hole or dark spot, it is worth booking an assessment. Your dentist will examine the tooth and may take an X-ray to see the extent of any decay.

Step by step

Cavities are often found during a routine check-up and clean before they cause symptoms. If you have noticed toothache, sensitivity to hot or cold, or a visible hole or dark spot, it is worth booking an assessment. Your dentist will examine the tooth and may take an X-ray to see the extent of any decay.

1. Numbing (if needed). Local anaesthetic can be used to numb the area for comfort. Very small fillings sometimes do not require it.
2. Removing decay. The dentist removes the decayed or damaged part of the tooth, aiming to keep as much healthy structure as possible.
3. Preparing the surface. The tooth is cleaned and lightly etched to create a surface the composite can bond to.
4. Placing and curing. The resin is applied in layers, each hardened with a curing light.
5. Shaping and polishing. The filling is sculpted to match the tooth and bite, then polished smooth.
6. Checking your bite. The dentist checks the filling does not sit too high and adjusts it so it feels natural.

How long does it take?

A single filling typically takes around 20–45 minutes, depending on its size and location. Larger or multiple fillings take longer. Once any anaesthetic wears off you can usually eat and drink as normal, though some people notice short-term sensitivity.

How long do composite fillings last?

Composite white fillings can last for many years, but longevity varies considerably from person to person and tooth to tooth, so no single figure applies to everyone. Rather than relying on one number, it helps to understand what influences lifespan:

• Size and location. Small fillings on low-stress surfaces tend to last longer than large fillings on molars that take heavy chewing forces.
• Your bite and grinding habits. Clenching or grinding (bruxism) places extra stress on fillings and can shorten their life.
• Oral hygiene. Brushing twice daily, flossing and regular dental visits help protect the filling and surrounding tooth.
• Diet. Frequent sugary or acidic foods can increase the risk of new decay at the filling’s edges.

No filling is permanent. Over time, fillings can wear, chip or develop decay at the margins, which is why routine check-ups matter — your dentist can identify a filling that is starting to fail before it becomes a larger problem.

Composite fillings vs amalgam (and other options)

Here is a general comparison of composite with the main alternatives. The right choice depends on your individual tooth and is a decision to make with your dentist.

What the amalgam phase-down means for you

There is a global shift away from amalgam. Under the Minamata Convention on Mercury, amalgam use in children under 15 and in pregnant or breastfeeding patients has been restricted since 2023, except where a practitioner considers it clinically necessary. At the treaty’s sixth Conference of the Parties in November 2025, parties agreed to set 2034 as the global phase-out date, after which the manufacture, import and export of dental amalgam will no longer be permitted. In practice, many Australian dentists already use composite as their default restorative material. If you are offered a white filling today, it reflects what has become standard practice for many restorations.

How much do composite white fillings cost in Australia?

Filling costs vary between practices and depend on your individual tooth, so any figure should be treated as a general guide rather than a quote. The main factors are the size of the cavity (measured in “surfaces”) and the tooth’s location. Composite typically costs a little more than amalgam for the same cavity, reflecting the material and technique involved.

Dental fees in Australia are itemised by the Australian Dental Association using item numbers (for example, items 521–536 cover common fillings). Asking your dentist for the relevant item numbers lets you check your rebate with your health fund in advance. A few things worth knowing:

• Extras cover can help. If you have private health insurance with dental extras, it may reduce your out-of-pocket cost, and many practices process claims on the spot via HICAPS so you pay only the gap.
• Ask for item numbers. These let you confirm your rebate with your fund before treatment.
• Get it in writing. A clear practice will provide a personalised treatment plan with costs before proceeding.

Orion’s Dental can provide a clear, itemised estimate at your assessment so you know the costs before any treatment goes ahead.

How to care for your composite fillings

Caring for a composite filling is largely about caring for your teeth well:

• Brush twice a day with fluoride toothpaste and floss daily, paying attention to the gumline and filling edges.
• Be mindful of staining foods and drinks. Coffee, tea, red wine and other staining items can, over time, slightly change the shade of a composite filling.
• Ease off very hard foods. Avoid using filled teeth to crunch ice or open packaging.
• Manage grinding. If you clench or grind, ask your dentist whether a night guard is appropriate.
• Keep up regular check-ups. Routine visits let your dentist identify wear or new decay early.

Mild sensitivity for a short period after a filling is common and usually settles. If sensitivity is severe, lasts more than a week or two, or your bite feels uneven, contact your dentist for a review.

When might another restoration be recommended?

A composite filling is not always the most suitable option. Your dentist may discuss an alternative when:

• The cavity is very large and too much tooth structure has been lost for a filling to be reliable
• The tooth is under heavy chewing load and may benefit from a stronger inlay, onlay or crown
• The tooth is cracked or weakened and needs more comprehensive protection
• Decay has reached the nerve, which may require root canal treatment before the tooth is restored

In these cases, a more robust restoration may protect the tooth better. This is a clinical judgement your dentist makes based on your specific tooth — being offered an alternative to a simple filling is not a cause for concern and is often the more tooth-preserving choice.