Dental Mercury Amalgam Fillings — Exposure, Toxicity, and Global Regulation.
Detoxification Strategies Adopted to Support the Body’s Own Systems
Dr. Bita Fox, DDS, MIAOMT
Munro-Hall Clinic, Weybridge, United Kingdom
Abstract
Dental amalgam, containing approximately 50% elemental mercury (Hg⁰), has long
served as a reliable restorative material due to its strength and ease of manipulation.
However, extensive research demonstrates that amalgam continuously releases
mercury vapour, particularly during mastication, thermal exposure, or removal with
rotary instruments. Up to 80% of inhaled vapour is absorbed via pulmonary tissue and
distributed to critical organs, including the brain, kidneys, and liver. Mercury’s affinity for
sulfhydryl groups inhibits enzyme activity, disrupts mitochondrial function, and impairs
natural detoxification mechanisms. Chronic exposure has been linked to
neurobehavioral, renal, immune, and endocrine dysfunctions, while both elemental and
organic mercury can cross the blood–brain and placental barriers, contributing to
neurotoxicity and developmental risks. Recent global initiatives, such as the UN
Minamata Convention on Mercury (2017) and the EU’s 2025 phase-out of dental
amalgam, mark pivotal steps toward reducing environmental mercury burden.
Transitioning to mercury-free materials, alongside enhanced safety measures for both
patients and dental teams, is essential. This review highlights the biological and
systemic implications of mercury exposure, the evolving regulatory framework, and the
growing necessity of adopting detoxification strategies—such as nutritional optimization,antioxidant support, and chelation protocols—that reinforce the body’s own elimination systems. A shift toward biological dentistry—integrating patient safety, environmental sustainability, and biocompatibility—represents not only a clinical but also an ethical imperative in contemporary practice.
Learning Objectives
- Understand the mechanisms and pathways of mercury vapour release and
systemic absorption from dental amalgam. - Recognize the biological and clinical effects of chronic mercury exposure on
neural, renal, and immune functions. - Identify evidence-based detoxification strategies that support endogenous
elimination and promote safe, mercury-free restorative practice.