Objectives In 2013, the United Nations Environment Programme (UNEP) reached a binding agreement – a.k.a. the Minamata treaty – to decrease dental amalgam use. This study aims to investigate US dentists’ current practice and opinions about amalgam use, and to determine factors affecting their amalgam use and opinions. Methods A total of 45,557 general dentists and 5,101 pediatric dentists were invited to participate in a pre-tested electronic survey. The survey consisted of 12 close-ended questions using a 5-point Likert Scale. The Qualtrics™ software was used to distribute the survey, followed by three reminders. Results Response rate was 5.2 percent for general dentists, and 17.6 percent for pediatric dentists. Sixty-two percent of general dentists and 56 percent of pediatric dentists reported using amalgam. Most dentists disagreed with banning amalgam, while agreeing with installing amalgam separators. Environmentally conscious dentists were more likely to agree with banning amalgam and installing amalgam separators. Conclusion Responding dentists favor the continued use of dental amalgam. Their perspectives vary by several factors including dentists’ environmental consciousness. Policies toward minimizing amalgam’s environmental impact need to be implemented.