In this demonstration photo of a mannequin, experts used a trick discovered by chemists to show how much mercury can be released when a mercury filling is drilled out of a tooth without protective measures. Only the mercury atoms can absorb photons beamed toward the mannequin at a specific wavelength.
In this demonstration photo of a mannequin, experts used a trick discovered by chemists to show how much mercury can be released when a mercury filling is drilled out of a tooth without protective measures. Only the mercury atoms can absorb photons beamed toward the mannequin at a specific wavelength. Courtesy of Randall Moore Courtesy of Randall Moore
In this demonstration photo of a mannequin, experts used a trick discovered by chemists to show how much mercury can be released when a mercury filling is drilled out of a tooth without protective measures. Only the mercury atoms can absorb photons beamed toward the mannequin at a specific wavelength. Courtesy of Randall Moore Courtesy of Randall Moore

Dental group defends mercury fillings amid mounting evidence of risks

January 05, 2016 02:10 PM

UPDATED January 08, 2016 11:27 AM

More Videos

When is a background check mandatory for gun owners? 1:51

When is a background check mandatory for gun owners?

Radio host accepts Senator Franken's apology, recounts moment of sexual assault 1:36

Radio host accepts Senator Franken's apology, recounts moment of sexual assault

Virginia's newly-elected openly transgender state representative: Discrimination is a disqualifier 2:56

Virginia's newly-elected openly transgender state representative: Discrimination is a disqualifier

California congressman skips moment of silence to talk gun control 1:07

California congressman skips moment of silence to talk gun control

Grace Mugabe’s fierce battle for power in Zimbabwe 1:44

Grace Mugabe’s fierce battle for power in Zimbabwe

House Speaker Paul Ryan touts savings in GOP tax plan 1:03

House Speaker Paul Ryan touts savings in GOP tax plan

President Trump stops motorcade to greet supporters 10:18

President Trump stops motorcade to greet supporters

Rookie Democratic candidate Ashley Bennett defeats GOP incumbent in NJ 3:58

Rookie Democratic candidate Ashley Bennett defeats GOP incumbent in NJ

A Miami congressional candidate talks about her encounters with extraterrestrials 8:56

A Miami congressional candidate talks about her encounters with extraterrestrials

What is the estate tax and who does it benefit? 0:51

What is the estate tax and who does it benefit?

  • When is a background check mandatory for gun owners?

    The Brady Act made background checks a requirement for guns purchased through licensed dealers. Here’s a brief look at how the current system works.