Amalgam filling removal is not needed to detox your body, but it can be worthwhile when a filling is failing, decay has formed around it or the tooth is at risk of breaking. If you are weighing up amalgam filling removal, the most useful question is not whether the metal is harmful, but whether this particular filling and tooth need replacing. In my experience, most patients who ask about it are relieved to hear that a sound filling can usually be left alone and watched.
Key Takeaways
- Amalgam is a mix of liquid mercury with silver, tin and copper. Once it has set it is stable, and major dental bodies, including the Australian Dental Association, consider it safe for most people.
- Removing a sound filling takes away healthy tooth structure and briefly increases exposure to mercury vapour, so it is not done as a routine detox.
- Good reasons to replace a filling include decay underneath or around it, a crack, worn or leaking edges, a tooth at risk of fracture, a confirmed allergy and, sometimes, appearance.
- When removal is needed, dentists typically use protective steps such as a rubber dam, high-volume suction and water cooling.
- Unnecessary removal is generally avoided during pregnancy, although urgent treatment can still be done. Talk to your dentist and GP.
- Replacement depends on how much healthy tooth remains: a filling, an onlay or a crown may be suitable.
What Amalgam Is and Why There Is a Debate
Dental amalgam has been used for well over a century. It combines liquid mercury with a powder of silver, tin and copper, which sets into a hard, durable filling. The concern people raise is the mercury. Once amalgam has set, the mercury is bound within the alloy, and the small amount of vapour released during chewing is low. Major reviews have not found that amalgam causes systemic illness in the general population, with the exception of rare allergic or lichenoid reactions.
At the same time, there is a global policy move to reduce the use of amalgam, mainly for environmental reasons, under the Minamata Convention. That is a different matter from whether the fillings already in your mouth are harming you. Our article on whether silver amalgam fillings are safe goes into the research in more depth.
Is Removing Amalgam a Good Way to Detox
No. There is no good evidence that removing sound amalgam fillings improves general health in people without an allergy. Taking out a filling that is doing its job has real downsides. Your dentist has to drill away part of the filling and often a little of the surrounding tooth, so the tooth gets slightly weaker with each replacement. The drilling also briefly raises mercury vapour in the room, which is why precautions matter when removal is truly needed.
If you have symptoms such as fatigue, headaches or aches and pains and wonder whether your fillings could be involved, please see your GP first. Those symptoms have many possible causes, and a medical review is the right place to start. Do not stop or change any prescribed medicine without speaking to your doctor or pharmacist.
Good Reasons to Replace an Amalgam Filling
There are sound clinical reasons to replace a filling. The most common are:
- Decay under or around the filling, often found on an X-ray
- A crack in the filling or in the tooth
- Worn, chipped or leaking edges that let bacteria in
- A large old filling that leaves the tooth at risk of fracturing
- A confirmed allergy or lichenoid reaction to amalgam, which is rare
- Appearance, if you would prefer a tooth-coloured restoration
Fillings do not last forever. Our guide on how long fillings last explains why older restorations eventually need attention, and the article on amalgam tattoo and grey marks on the gum covers a harmless cosmetic issue that sometimes prompts questions.
| Reason for removal | Usual approach | Notes |
|---|---|---|
| Decay under or around the filling | Remove the filling, clean out the decay and rebuild the tooth | Often the most common reason, and the amount of tooth left decides the type of restoration |
| Cracked filling or tooth | Assess the crack and, where suitable, replace with an onlay or crown | Cracks can progress, so early review helps |
| Worn or leaking edges | Replace or repair the filling | Small defects are sometimes monitored first |
| Tooth at risk of fracture | Consider an onlay or crown for protection | Depends on how much healthy tooth remains |
| Confirmed allergy or lichenoid reaction | Replace with another material after assessment | Rare, and usually involves your doctor too |
| Appearance only | Discuss whether replacement is worth the loss of tooth structure | A personal choice, with pros and cons to weigh |
| Sound filling, no symptoms | Usually leave it and monitor at check-ups | Removal for detox purposes is not advised |
Protective Steps When Amalgam Is Removed
When removal is needed, dentists typically use several protective steps to reduce exposure for both the patient and the team. These generally include:
- A rubber dam, a thin sheet that isolates the tooth and reduces what you swallow or inhale
- High-volume suction close to the tooth
- Water cooling to limit heat and vapour
- Sectioning the filling into larger pieces rather than grinding it to fine particles
- A source of fresh air or nasal oxygen for the patient in some set-ups
Practices also use amalgam separators on their suction systems so that waste does not enter the water supply. If you are having a filling replaced, it is reasonable to ask what protective steps will be used at your appointment.
What Can Replace an Amalgam Filling
The right replacement depends on how much healthy tooth is left after the old filling and any decay are removed. Options generally include:
- A tooth-coloured composite filling for small to medium cavities
- A glass ionomer filling in selected situations, which our article on when dentists use glass ionomer fillings explains
- An onlay or inlay when a larger part of the tooth needs rebuilding, as covered in our inlay, onlay, crown and filling guide
- A crown when a tooth is heavily broken down, which is discussed in when a filling needs to become a crown
To compare materials side by side, see our article on white vs silver fillings. Each material has strengths and trade-offs, so it is worth discussing what suits your tooth, your bite and your budget.
Pregnancy, Allergies and Special Cases
During pregnancy, removing sound amalgam fillings is generally avoided, because there is no benefit to doing it and it adds unnecessary exposure. If a tooth is painful, infected or breaking, urgent treatment can still be done, and your dentist can talk through the timing and approach with you and your GP. Our guide to dental care during pregnancy covers this in more detail.
A genuine allergy to a dental metal is uncommon, but it does happen, and so do localised lichenoid reactions in the soft tissue next to a filling. If you have a rash, a white lacy patch or soreness beside an amalgam filling, mention it to your dentist and GP. Our article on allergic reactions to dental materials explains the signs to look for.
Common Questions
Is it safe to have amalgam fillings removed?
It can be done safely with the right precautions, but it is only worthwhile when there is a clinical reason. Protective steps such as a rubber dam, high-volume suction and water cooling are typically used to limit exposure.
Do amalgam fillings make you sick?
Major reviews have not found that amalgam causes systemic illness in the general population. The exception is the rare person with a true allergy or a lichenoid reaction, which a dentist and doctor can assess together.
Should I remove amalgam fillings before pregnancy?
Generally there is no need to, and unnecessary removal is avoided during pregnancy. If you are planning a pregnancy and have a failing filling, talk to your dentist and GP about the best timing.
Does removing amalgam fillings detox the body?
No. There is no good evidence that removing sound fillings improves general health, and removal takes away healthy tooth structure. See your GP if you have ongoing symptoms that concern you.
What is the best replacement for an amalgam filling?
It depends on how much healthy tooth remains. Smaller cavities may suit a tooth-coloured filling, while larger areas may need an onlay or crown, and your dentist can explain which fits your tooth.
Talk to Us About Your Fillings
If you are unsure whether your old fillings need attention, the team at Lumi Dental in Melrose Park can examine them, take X-rays where appropriate and explain your options in plain language. You can read about our general dentistry services in Melrose Park, and see our current deals page for offers. We are happy to offer a free consult and written quote, and for a general idea of costs you can read our dental filling cost guide.
