One of the most common questions we hear at MI Dental in Kitchener is whether patients should have their Silver (Amalgam) fillings replaced with tooth-colored (White) ones. Some are concerned about Mercury in their fillings, while others are simply seeking a more esthetic smile. Before making a decision, it is important to understand the facts and consider both the benefits and risks of replacement.
What Are Silver (Amalgam) Fillings?
Silver fillings or dental Amalgam has been used for more than a century. They are made from a combination of Silver, Tin, Zinc, Copper and Mercury. Despite the concern the word “Mercury” can cause, when it is bound with the other metals, it forms a stable, durable compound.
Amalgam fillings are particularly well suited for:
- Large cavities, especially in molars that take the brunt of chewing
- Areas that are hard to keep dry during placement
- Children or individuals with special needs who may have difficulty sitting still for long procedures
Because of their strength and ease of placement, Amalgam fillings continue to be a trusted option in specific clinical scenarios.
Is Mercury in Fillings Harmful?
The safety of amalgam has been extensively studied. Health authorities including the American Dental Association (ADA), Centers for Disease Control and Prevention (CDC), U.S. Food and Drug Administration (FDA), and World Health Organization (WHO) have all concluded that dental Amalgam is a safe and effective material for cavity treatment.
The trace amount of Mercury present becomes inert and safe once it is bound in the amalgam alloy.
Our Treatment Philosophy at MI Dental
At MI Dental, our approach is conservative and evidence-based. If an existing silver filling is:
- Intact (not broken or leaking),
- Asymptomatic (not causing pain or sensitivity),
- Functioning well
Then we typically do not recommend replacing it. Unnecessary removal of an otherwise stable filling can result in loss of healthy tooth structure and sometimes introduces transient sensitivity, particularly to cold liquids. This sensitivity usually resolves on its own within a few weeks.
The Curious Case of Oral Galvanic Shock
In rare cases, a patient may experience a strange, sharp “electric shock” sensation when biting down. This can occur when two opposing metal fillings (such as upper and lower amalgams) contact each other and create a tiny electrical current in the moist environment of the mouth. This is known as Oral Galvanic Shock.
This phenomenon can be confusing, even for dentists because the teeth and gums may appear completely healthy. In such cases, replacing one or both metal fillings with a non-metallic material can resolve the issue.
White Fillings: A Tooth-Colored Alternative
Today’s white fillings are made from composite resin, a blend of plastic and powdered glass. They offer several advantages:
- Match your natural tooth color, making them ideal for visible areas
- Require less removal of healthy tooth structure compared to Amalgam
- BPA-free options are available for patients with sensitivity to specific materials
However, composite fillings also come with some drawbacks:
- Higher cost than Silver fillings
- Longer placement time, requiring precise technique
- In some cases, inlays or onlays may require more than one visit
What If You Just Want Them Gone for Aesthetic Reasons?
If your primary concern is appearance, we understand. Some patients simply don’t like the look of Silver fillings. If so, we can absolutely replace them. That said, it is worth noting that Amalgam is usually placed in molars or premolar teeth, not the Esthetic Zone, they don’t show when you speak or smile.
We will always walk you through the pros and cons, including cost, longevity and any risks involved, so you can make an informed decision.
The Bottom Line: It’s a Personal Choice, Informed by Professional Guidance
Whether to replace Silver fillings comes down to individual needs and clinical indications. At MI Dental, we are here to provide straightforward, personalized advice. We won’t recommend a procedure unless it is truly in your best interest.
If your Amalgam fillings are performing well and are not causing issues, there may be no need to disturb them. However, if you are experiencing symptoms, want an updated look or simply want to discuss your options, we are here to help you make the right call.
