More Videos

Student walkouts, marches take gun control fight to the streets 1:37

Student walkouts, marches take gun control fight to the streets

Sheriff, NRA spokeswoman, clash at CNN Town Hall 1:21

Sheriff, NRA spokeswoman, clash at CNN Town Hall

Shooting reported near Fort Meade NSA campus 1:13

Shooting reported near Fort Meade NSA campus

Dow first falls 500 points as U.S. stock market opens, then recovers most of losses 1:49

Dow first falls 500 points as U.S. stock market opens, then recovers most of losses

Two students shot inside California middle school 0:58

Two students shot inside California middle school

Hawaii 'ballistic missile threat' false alarm, sent in error 0:44

Hawaii 'ballistic missile threat' false alarm, sent in error

Fire breaks out at Trump Tower in New York 0:26

Fire breaks out at Trump Tower in New York

FCC votes to repeal net neutrality regulations 0:17

FCC votes to repeal net neutrality regulations

FCC net neutrality vote interrupted due to security concern 0:54

FCC net neutrality vote interrupted due to security concern

Protesters rally against FCC net neutrality vote 1:44

Protesters rally against FCC net neutrality vote

In the offices of North Carolina dentist Matthew Young, retired Chairman Boyd Haley of the University of Kentucky’s chemistry department assists in demonstrating how much mercury is released during drilling to remove a mercury filling from a tooth placed in a mannequin. Unlike in many dental offices, the experiment did not use a high-speed vacuum to suction waste from a patient's mouth. This is a scenario that happens everyday in dental schools and some dental offices. Courtesy of Randall Moore, director/producer of the documentary Evidence of Harm
In the offices of North Carolina dentist Matthew Young, retired Chairman Boyd Haley of the University of Kentucky’s chemistry department assists in demonstrating how much mercury is released during drilling to remove a mercury filling from a tooth placed in a mannequin. Unlike in many dental offices, the experiment did not use a high-speed vacuum to suction waste from a patient's mouth. This is a scenario that happens everyday in dental schools and some dental offices. Courtesy of Randall Moore, director/producer of the documentary Evidence of Harm

Mercury from fillings in your teeth can’t go down public sewers anymore, EPA rules

December 19, 2016 12:00 PM

More Videos

Student walkouts, marches take gun control fight to the streets 1:37

Student walkouts, marches take gun control fight to the streets

Sheriff, NRA spokeswoman, clash at CNN Town Hall 1:21

Sheriff, NRA spokeswoman, clash at CNN Town Hall

Shooting reported near Fort Meade NSA campus 1:13

Shooting reported near Fort Meade NSA campus

Dow first falls 500 points as U.S. stock market opens, then recovers most of losses 1:49

Dow first falls 500 points as U.S. stock market opens, then recovers most of losses

Two students shot inside California middle school 0:58

Two students shot inside California middle school

Hawaii 'ballistic missile threat' false alarm, sent in error 0:44

Hawaii 'ballistic missile threat' false alarm, sent in error

Fire breaks out at Trump Tower in New York 0:26

Fire breaks out at Trump Tower in New York

FCC votes to repeal net neutrality regulations 0:17

FCC votes to repeal net neutrality regulations

FCC net neutrality vote interrupted due to security concern 0:54

FCC net neutrality vote interrupted due to security concern

Protesters rally against FCC net neutrality vote 1:44

Protesters rally against FCC net neutrality vote