News + Research

On topic with Dr. Dill: Are silver fillings safe?



Dental amalgam fillings are one of the oldest and most common ways to fill a cavity. They’re sometimes called “silver fillings” because of their metallic color.


Amalgam fillings are durable and long-lasting. They are made of mercury, silver, copper and tin, and sometimes include a small amount of other metals such as zinc and indium. Amalgam fillings generally cost less than tooth-colored composite fillings, which are made with a type of plastic resin and glass.

Use of silver fillings


years of history         

10s of millions

fillings placed each year


About half of dental amalgam is liquid mercury, which is used to bind the metal particles together into a hard, strong filling. Over time, amalgams can release a very low level of mercury vapor, but extensive research shows amalgam fillings are safe and not harmful to the health of the large majority of people. This has been verified by the U.S. Food and Drug Administration (FDA), Centers for Disease Control and Prevention, World Health Organization and American Dental Association. The FDA also does not recommend removing existing silver fillings, unless medically necessary.

Certain groups who may face greater health risks from exposure to even small amounts of mercury should avoid amalgam if possible, according to the FDA. These include women who are pregnant or nursing; children under 6; people with impaired kidney function or neurological diseases such as multiple sclerosis, Alzheimer's disease or Parkinson's disease; and those allergic to mercury or other metals in amalgam.

There are advantages and disadvantages to all types of dental fillings. Check with your dentist about which type of filling is best for your needs and situation. Prevent tooth decay and the need for fillings in the first place by brushing and flossing daily, eating a balanced diet, limiting sugar and visiting the dentist regularly.

Meet Delta Dental’s Vice President of Dental Science and Network Strategy, Joseph Dill, DDS. With more than 30 years of experience in the dental field, including eight in private practice and 16 in dental insurance, Dr. Dill provides expert insights and helpful advice to keep you smiling bright.