You’re in the chair, you’ve just been told you need a filling, and someone asks whether you’d like white or silver. Most people say white and move on. It’s a reasonable answer, but it isn’t always the only thing that matters, and the decision is usually less about preference than people assume. Below is what actually goes into choosing a dental filling material, what each option is good and less good at, and where the mercury question sits these days.
The Short Version: What Decides Which Filling You Get
Colour is the part patients think about. Your dentist is weighing up several other things at the same time, and often those factors narrow the choice before preference comes into it at all.
According to the Australian Dental Association’s guidance on filling materials, the factors influencing which material gets used include where the tooth sits in your mouth, how your teeth bite together, and how big the filling needs to be. The quick summary:
- Composite resin, the tooth-coloured option, is what most Australian dentists now use as standard
- Amalgam is far less common than it once was, and some dentists don’t use it at all
- Bigger cavities and heavy biting forces may push the decision away from a straightforward filling entirely
- No material lasts forever, and that’s normal rather than a sign something went wrong
- Which material suits your tooth may differ from one tooth to the next, even in the same mouth
The Materials Your Dentist Chooses Between
There are more options than the white-or-silver question suggests, and each material has a job it does particularly well. Most dental fillings placed today fall into one of these four groups.
Composite Resin, the Tooth-Coloured Option
This is a white filling material that can be shaded to match the tooth it’s going into. Dentists use it for front and back teeth, for repairing chips and decay, and for some cosmetic work.
The advantage that matters most isn’t the colour. Composite is bonded, or glued, to the tooth surface, which means less healthy tooth structure needs to be cut away to hold it in place. Keeping more of your own tooth is worth something over a lifetime.
Amalgam, the Silver One
Amalgam is a mixture of metals including silver, copper, tin, zinc and mercury. Dentists have used it for over 150 years, and it’s strong and long-lasting.
It works differently to composite, though. Amalgam doesn’t stick to the tooth. It’s held in place by the shape of the cavity cut into the tooth, which means more tooth structure has to be removed to keep it there. It’s also silver in colour and tends to darken with age. Between the extra tooth removal, the appearance and environmental concerns about mercury, its use has dropped away considerably.
Glass-Ionomer Cement
Also tooth-coloured, but not as strong as composite. It contains fluoride, which is useful in certain situations. You’ll most often see it used for temporary fillings, for fissure sealants, or in spots where a stronger material isn’t practical.
Gold and Porcelain Inlays
These are made outside your mouth in a dental laboratory, then bonded into the cavity. Both are strong and long-lasting, and porcelain can be shade-matched. The trade-off is time and cost, since they usually take at least two appointments rather than one.
The Mercury Question, Answered Plainly
This comes up often enough that it’s worth addressing directly rather than skipping past.
The Australian Dental Association states that there is no quality scientific research showing that using dental amalgam to fix teeth causes health issues, and that amalgam has fallen out of common use because of environmental concerns rather than patient health ones. Healthdirect notes that if you already have amalgam fillings you shouldn’t need to have them replaced unless your dentist identifies a specific reason.
That last point is the practical one. Replacing a sound amalgam filling means cutting away more tooth structure to get it out, and the replacement won’t necessarily perform better than what’s already there. Some people choose to swap them for appearance reasons, which is a fair thing to want. It’s just worth knowing it isn’t a health necessity.
There are situations where a dentist may pick something other than amalgam, including during pregnancy or breastfeeding, for people with kidney disease, and for children. Treatment suitability depends on individual circumstances, so this is a conversation to have rather than a rule to apply yourself.
When a Filling Isn’t the Right Repair
Sometimes the honest answer is that no filling option is the right call, and that’s worth knowing before you’re surprised by it mid-appointment.
If a cavity is very large, there may not be enough tooth left to hold a filling reliably. Rebuilding most of a tooth in composite leaves thin walls that can crack under chewing. In those cases a crown may be suggested instead, since it covers the tooth rather than sitting inside it.
If decay has reached the nerve, filling over the top won’t settle things down. Root canal treatment may be needed first, with a filling or crown afterwards. Neither of these means anything has gone wrong. It usually just means the decay got further along before it was picked up.
Living With Your Filling
Sensitivity in the First Week or Two
A filled tooth can feel sensitive to hot, cold or biting pressure afterwards. This normally settles within a few days, though it can take a week or two. If it’s getting worse rather than better, or it hasn’t eased after that, go back and have it looked at.
How Long Fillings Actually Last
Fillings don’t last forever, and how long yours lasts depends partly on how you look after it. Over time the join between tooth and filling can open up, letting food and bacteria collect there, which can start new decay underneath.
A few things that help:
- Keep up brushing and cleaning between teeth, especially around older fillings
- Go steady on ice, hard lollies and using teeth to open things
- Mention grinding or clenching, since that shortens the life of any restoration
- Keep up regular check-ups and cleans so problems under a filling get found early
One thing worth knowing: a white filling changing colour with age doesn’t automatically mean it needs replacing. If it still seals properly, colour alone is a cosmetic matter, not a clinical one.
Frequently Asked Questions
Are White Fillings as Strong as Silver Ones?
Amalgam has a long track record for strength, though composite materials have improved considerably and are used routinely on back teeth. Which one holds up better in your mouth depends on the size of the cavity, your bite and your habits. Your dentist can advise what suits the specific tooth.
Should I Replace My Old Amalgam Fillings?
Not usually. Sound amalgam fillings generally don’t need replacing unless there’s a clinical reason, such as cracking, leaking or decay underneath. Replacing them means removing more tooth structure. Patients in Cranbourne and Cranbourne North often raise this, and an examination will tell you whether yours need attention.
Why Do White Fillings Sometimes Cost More?
Composite takes longer to place and the technique is more demanding, since the tooth has to stay dry while the material is bonded and cured in layers. Costs vary between practices and depend on the size and location of the filling. It’s worth asking for an estimate before treatment so there are no surprises.
Can I Choose Which Dental Filling Material I Get?
You can express a preference, and many people do. Some situations may limit the options, though, such as a cavity below the gum line where moisture control is difficult. Treatment suitability depends on individual circumstances, so it works better as a discussion with your dentist.
How Do I Know If a Filling Needs Replacing?
Signs may include sensitivity that doesn’t settle, a rough or catching edge, food packing in around it, or pain on biting. Some failing fillings cause no symptoms at all, which is why routine visits matter for patients across Skye, Junction Village and Langwarrin. Only an examination and sometimes an x-ray can confirm it.
Ask a Cranbourne West Dentist About Your Filling Options
Being told you need a filling isn’t anyone’s idea of good news, but knowing what the options are makes the appointment a lot less unsettling. The team at Cranbourne West Dental will talk you through which materials suit your tooth, what each will cost, and what happens if a filling isn’t the right fix. Ask as many questions as you like. That’s what the appointment is for.