If you need a filling, you may wonder how the modern tooth-colored fillings we use compare with the traditional silver amalgam fillings many of us remember. Both are ways to repair a tooth after decay, but they differ in appearance, how they bond to the tooth, and a few other practical ways. Here is a clear, balanced comparison to help you understand the options we offer at our Fremont office.
What each filling is made of
Amalgam fillings, often called silver fillings, are made from a mix of metals including silver, tin, copper, and mercury bound together. They have been used for well over a century and are known for being strong and long-lasting. Tooth-colored fillings, also called composite fillings, are made from a tooth-colored resin and are mercury-free. At our practice we use composite, which lets us restore teeth without metal and with a natural appearance.
Appearance
The most obvious difference is how they look. Amalgam fillings are silver and become more noticeable over time, especially on teeth that show when you talk or smile. Composite fillings are matched to the shade of your natural tooth, so they blend in and are very hard to spot. For front teeth and visible areas, tooth-colored fillings are the clear choice, and many patients prefer them for back teeth too, simply because they like a metal-free smile. If improving the look of your smile is a goal, you may also be interested in our cosmetic dentistry options.
How they bond and how much tooth is preserved
This is an important and often overlooked difference. Amalgam does not bond to the tooth; it is held in place mechanically, which sometimes requires removing a bit more healthy tooth structure to create a shape that locks the filling in. Composite, by contrast, bonds directly to the tooth. That adhesive bond often allows the dentist to remove only the decayed portion and conserve more of the healthy tooth. Preserving natural tooth structure is good for the long-term strength of the tooth.
Durability and longevity
Amalgam has a well-earned reputation for durability, particularly in large fillings on back teeth that absorb heavy chewing forces. Composite materials have improved dramatically and now hold up very well in most situations, including many back teeth. The right material for a given tooth depends on the size and location of the cavity and your bite. You can learn more about composite lifespan in our guide on how long composite fillings last.
What about mercury?
Some patients ask about the mercury in amalgam. Major health organizations, including the American Dental Association, consider amalgam a safe and effective filling material (ada.org). That said, many patients simply prefer a mercury-free, metal-free option for personal reasons or appearance, and composite gives them that choice. We are glad to discuss your preferences and answer any questions.
Which filling is right for you?
For most patients today, tooth-colored composite offers an excellent combination of natural appearance, conservative preparation, and durability. The best choice still depends on the specific tooth, the size of the cavity, and your goals, which is why an exam matters. Fillings are part of our broader restorative dentistry and preventive care. At our Fremont office, Dr. Anna Yi will explain what your tooth needs and recommend the most suitable option. We welcome patients from Fremont and nearby Newark and Union City. To learn more, contact us.
Have questions about tooth-colored fillings (mercury-free) in Fremont? Our team is happy to help.