Question: What are silver (amalgam) fillings and are they safe?
Explanation: Amalgam is the traditional “silver” filling material — a durable alloy of silver, tin, copper, and mercury that has been used for over 150 years. It’s strong, long-lasting, and less expensive than tooth-colored alternatives, which is why many people still have them. Major health organizations, including the ADA and FDA, consider amalgam safe for most adults; the mercury is bound in the alloy. The FDA does suggest certain groups — pregnant women, young children, people with mercury sensitivity or kidney issues — discuss alternatives with their dentist. Most amalgams don’t need replacing unless they crack, leak, or develop decay around them.
Related Questions:
Should I have my old amalgam fillings removed? Not just because they’re amalgam. Removing intact fillings sacrifices healthy tooth structure. Replace them when they fail — cracks, leaks, or new decay.
Why did my dentist recommend replacing my amalgam? Usually because the filling or tooth has cracked, the margins are leaking, or decay has formed underneath — visible on X-ray or exam.
Do amalgam fillings cause teeth to crack? Large, old amalgams can act like a wedge over decades of chewing, which is one reason big silver fillings are often eventually upgraded to crowns or onlays.