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IMERC Fact Sheet

Mercury Use in Dental Amalgam

Latest Update: June 2010

“Mercury Use in Dental Amalgam” summarizes the use of mercury in dental amalgam, including 

the total amount of mercury amalgam sold in the U.S. in 2001, 2004, and 2007.

The information in the Fact Sheet is based on data submitted to the state members of the 

Interstate Mercury Education and Reduction Clearinghouse (IMERC)1including Connecticut, 

Louisiana, Maine, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont. The 

data is available online through the IMERC Mercury-Added Products Database.2 

A number of important caveats must be considered when reviewing the data summarized in this 

Fact Sheet:

 The information may not represent the entire universe of dental amalgam sold in the U.S. 

The IMERC-member states continuously receive new information from mercury-added 

product manufacturers, and the data presented in this Fact Sheet may underestimate the 

total amount of mercury sold in this product category. 

 The information summarizes mercury use in dental amalgam sold nationwide since 2001. 

It does not include mercury amalgam sold prior to January 1, 2001 or exported outside of 

the U.S.

 Reported data includes only mercury that is used in the product, and does not include 

mercury emitted during mining, manufacturing, or other points in the products’ life cycle. 

Mercury Use in Dental Amalgam

Dental amalgam, used in restorative work for filling teeth, is an alloy that contains silver, tin, 

copper, other metallic elements, and mercury, which typically makes up about 50 percent of the 

amalgam. Historically, dentists mixed amalgam on-site using bulk liquid mercury and metal 

powders, but today dental amalgam is purchased in pre-dosed amalgam capsules that come in 

different sizes. The mercury content of each capsule can vary from 100 to 1,000 milligrams of 

mercury. 

Table 1 presents the total amount of mercury sold in dental amalgam in 2001, 2004, and 2007. 

Five dental amalgam manufacturers have submitted Mercury-added Product Notification Forms 

to IMERC-member states. More detailed information on the 2001 and 2004 data can be found in 

the report, Trends in Mercury Use in Products: Summary of the IMERC Mercury-added 

 

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IMERC: www.newmoa.org/prevention/mercury/imerc/about.cfm

2 Mercury-Added Products Database: www.newmoa.org/prevention/mercury/imerc/notification/index.cfm
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Products Database, June 2008.3 The 2007 data is taken from a NEWMOA presentation, Trends 

in Mercury Use in Products: Analysis of the IMERC Mercury-added Products Database, 

November 17, 2009.

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 The 2004 and 2007 totals were updated in June 2010 based on revised 

data submitted to IMERC by one of the dental amalgam manufacturers and differ slightly from 

the totals noted in the reports referenced above.

Table 1: Total Mercury Sold in Dental Amalgam (pounds)

Product Total Mercury 2001 Total Mercury 2004 Total Mercury 2007

Dental Amalgam 61,537 (30.8 tons) 53,213 (26.6 tons) 32,874 (16.4 tons)

[Note: 453.6 grams = 1 pound; All numbers are rounded to the nearest whole number.]

Reported use of mercury in dental amalgam sold in the U.S. in 2001 was approximately 30.8 

tons, decreasing to 26.6 tons in 2004, or by about 14 percent. The decrease in the use of mercury 

in dental amalgam from 2004 to 2007 was 10.2 tons, or approximately 38 percent. Increased 

consumer awareness of mercury use in fillings may drive future declines in mercury amalgam 

use; however, non-mercury fillings are more expensive, which can affect the preferences of 

patients for dental restorative materials.

Dental amalgam remains the second largest category of mercury use in products for all three 

IMERC reporting years (behind the category of switches and relays). Unlike other mercuryadded products, there are no state restrictions on the sale or distribution of dental amalgam. 

Disposal & Recycling

Over the past five years, many states have introduced best management practices (BMPs)

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for 

dental amalgam waste so that dental offices capture and recycle this waste. These BMPs include 

requirements for installing amalgam separators, properly managing solid waste with amalgam, 

and amalgam recycling. These practices can prevent mercury from dental amalgam entering 

wastewater, wastewater sludge, and solid waste and, therefore, help to reduce the environmental 

impact of dental amalgam wastes and discharges. 

The U.S. Food and Drug Administration (FDA) is currently evaluating its regulatory oversight of 

mercury dental amalgam. Since publishing the original proposed rule in 2002, the Agency has 

reopened the public comment period twice, in an effort to provide reasonable assurance of the 

 

3 Trends in Mercury Use in Products: Summary of the IMERC Mercury-Added Products Database: 

www.newmoa.org/prevention/mercury/imerc/pubs/reports.cfm

4 Trends in Mercury Use in Products: Analysis of the IMERC Mercury-added Products Database: 

www.newmoa.org/prevention/mercury/conferences/sciandpolicy/presentations/Wienert_Session3B.pdf

5 American Dental Association BMPs: 

www.ada.org/prof/resources/topics/amalgam_bmp.asp
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safety and effectiveness of dental amalgam. As of December 2009, the FDA is still in the 

process of analyzing the comments submitted.6

Non-Mercury Alternatives

Non-mercury resin and composite materials are substitutes for mercury dental amalgam fillings. 

These include glass ionomer, gold foil, cast gold alloy, porcelain, and metal ceramic restorative 

fillings and crowns. These alternatives are usually more costly than traditional amalgam fillings.

Composite resins are tooth-colored, plastic materials (made of glass and resin) that are used both 

as fillings and to repair defects in the teeth. Composites are often used on the front teeth where a 

natural appearance is important, but they can be used on the back teeth as well depending on the 

location and extent of the tooth decay.

Metal alloys include gold, copper, and other metals. They are very strong, making them 

effective for use in crowns, fixed bridges, and partial dentures. However, because of their metal 

color (gold or silver), they do not have the appearance of normal teeth.

For more information on the different types of dental fillings, visit: 

www.ada.org/public/topics/fillings.asp#restoring. 

 

6 Regulation of Dental Amalgams: 

www.fda.gov/NewsEvents/Testimony/ucm115161.htm