The U.S. Centers for Medicare and Medicaid Services (CMS) sent guidance to all state Medicaid directors on July 22, 2026, recommending they restrict or eliminate dental amalgam coverage and incentivize composite resin alternatives. While this is a U.S. policy move, it accelerates a global mercury phase-down that directly affects Canadian dental practices already adapting to Minamata Convention timelines and Health Canada advisories.
As of August 2026, the momentum toward mercury-free dentistry has shifted from aspiration to policy action. The CMS letter — while non-binding — represents the strongest signal yet from the largest public dental payer in North America that amalgam's era is ending. For Ontario dental professionals managing mixed-material workflows, this development carries practical implications for procurement, clinical protocols, and patient communication.
What CMS Actually Said on July 22
The Center for Medicaid and CHIP Services (CMCS) sent an informational bulletin to state Medicaid directors encouraging them to restrict or end coverage for dental procedure codes related to dental amalgam restorations. The guidance also encouraged directors to consider offering financial incentives to dentists who transition to resin-based composite materials for all direct restorations.
This is not a regulatory mandate. States retain full authority over their Medicaid dental benefit designs, and CMS explicitly framed the guidance as encouragement rather than requirement. However, the fact that CMS is actively nudging state Medicaid programs — which collectively cover over 90 million Americans with some form of dental benefit — marks a significant policy acceleration.
The Indian Health Service (IHS) has gone further, announcing plans to discontinue mercury amalgam use entirely by 2027, citing health concerns regarding mercury exposure in its patient population.
The Broader Context: Minamata Convention and WHO Guidelines
The CMS guidance does not exist in isolation. In November 2024, parties to the Minamata Convention on Mercury agreed to a global phase-out of dental amalgam by 2034. The World Health Organization followed in March 2026 with formal guidelines calling for accelerated transition to mercury-free restorative materials.
The European Union banned dental amalgam entirely in January 2024, having already restricted its use in children and pregnant women since 2018. Several countries in Africa and Southeast Asia have adopted similar restrictions under the Minamata framework.
Canada is a signatory to the Minamata Convention, but Health Canada has stated it does not expect to revise its national guidance on dental amalgam at this time. The agency continues to recommend limiting amalgam use in vulnerable populations — including children under six, pregnant women, and patients with kidney disease — while maintaining that amalgam remains safe for the general adult population.
What This Means for Canadian Dental Practices
Canadian dentists are not directly affected by CMS policy. However, the practical implications of the global phase-down are already arriving in Ontario operatories through several channels.
Supply Chain Shifts
Major dental manufacturers have been reducing amalgam product lines for years. As U.S. Medicaid programs begin restricting amalgam codes, manufacturing volumes will decline further, potentially increasing costs for the remaining inventory. Practices that still maintain amalgam in their supply chain should monitor pricing trends and consider whether to accelerate their transition timeline.
Patient Expectations
Patients increasingly arrive informed about mercury-free alternatives. Media coverage of the CMS guidance and the WHO guidelines has raised public awareness, particularly in urban markets like the Greater Toronto Area where health-conscious demographics are concentrated. Practices that have already transitioned to composite-only workflows have a straightforward story to tell patients asking about amalgam.
Regulatory Trajectory
While Health Canada has not signalled imminent changes, Ontario already requires dental offices to install amalgam separators under environmental regulations — an implicit acknowledgment that mercury waste from dental practices is an environmental concern. The Royal College of Dental Surgeons of Ontario (RCDSO) does not mandate against amalgam, but continuing education requirements increasingly emphasize composite techniques and bonded restorations.
Pro Tip: If your practice still offers amalgam restorations, document your clinical rationale for each placement. As regulatory expectations evolve, a clear record of decision-making protects both the practice and the patient relationship.
Clinical Considerations for the Transition
The shift from amalgam to composite is not purely administrative. Each material has distinct clinical properties that affect case selection, technique, and longevity.
Amalgam's traditional advantages — moisture tolerance, compressive strength in load-bearing posterior teeth, and simpler placement technique — have made it a staple in Canadian dental education for decades. Composite resins, meanwhile, have improved dramatically. Modern nano-hybrid and bulk-fill composites offer wear resistance and fracture toughness that approach amalgam performance in posterior restorations, while providing superior aesthetics and tooth-conserving preparation designs.
The technique sensitivity of composite placement remains a genuine clinical consideration. Isolation, incremental layering (or bulk-fill protocols with appropriate light-curing), and proper adhesive bonding all require training and attention that amalgam placement does not demand to the same degree. For practices making the transition, investing in hands-on continuing education on posterior composite technique is not optional — it is essential to clinical outcomes.
Pro Tip: If you are transitioning away from amalgam, start with Class I restorations in premolars where moisture control and access are favourable. Build confidence and refine your technique before moving to large Class II restorations in molars where the demands on bonding and isolation are higher.
Environmental and Regulatory Compliance in Ontario
Ontario dental offices are already required to use amalgam separators certified to the ISO 11143 standard, capturing at least 95% of amalgam waste before it enters municipal wastewater systems. This requirement, administered under Ontario's environmental protection framework, applies regardless of whether a practice is actively placing new amalgam restorations — any office that removes existing amalgam restorations must capture the waste.
Practices that have fully transitioned to composite may eventually be able to decommission their amalgam separators, but only after confirming they no longer encounter amalgam in any clinical procedure, including restorations being replaced. Given that millions of amalgam restorations remain in service across Ontario, amalgam separator maintenance will remain a compliance requirement for most practices for years to come.
Pro Tip: Review your amalgam separator maintenance logs quarterly. The Ontario Ministry of the Environment requires documented proof of proper waste handling, and inspectors can request these records. A lapsed maintenance schedule is one of the most common compliance findings in dental office environmental audits.
What Canadian Practices Should Do Now
The CMS guidance does not require immediate action from Canadian dentists. But treating it as a signal rather than noise is the pragmatic approach. Consider these steps:
- Audit your current amalgam usage: Track how many amalgam restorations your practice places monthly versus composite. If amalgam represents less than 10% of your direct restorations, the clinical transition is already functionally complete — formalize it.
- Review your procurement: Check with your dental supplier about amalgam availability timelines and pricing trends. Order strategically rather than scrambling if supply contracts.
- Update patient communication: If your practice has already eliminated amalgam, say so on your website and in new-patient materials. This is a genuine differentiator in patient choice, particularly in the GTA market.
- Invest in CE: Posterior composite placement continuing education remains one of the highest-value clinical investments a general practitioner can make. The Canadian Dental Association (CDA) and the Ontario Dental Association (ODA) both offer accredited courses on advanced adhesive dentistry and posterior composite technique.
- Monitor Health Canada: While no regulatory change is imminent, Health Canada will eventually need to reconcile its position with the 2034 Minamata deadline. Practices that have already transitioned will face zero disruption when that day arrives.
Frequently Asked Questions
Q: Does the CMS guidance affect Canadian dental practices directly?
No. The CMS guidance is directed at U.S. state Medicaid programs and has no regulatory authority in Canada. However, it accelerates global supply chain shifts and reflects a trajectory that will eventually reach Canadian regulatory frameworks under the Minamata Convention, to which Canada is a signatory.
Q: Has Health Canada banned dental amalgam?
Health Canada has not banned or restricted dental amalgam for the general adult population as of August 2026. The agency recommends limiting amalgam use in children under six, pregnant women, and patients with kidney disease, but maintains that amalgam is safe for other adults. Canada's obligations under the Minamata Convention include a 2034 global phase-out deadline.
Q: What alternatives to dental amalgam are most commonly used in Ontario?
Nano-hybrid and bulk-fill composite resins are the most common direct amalgam alternatives in Ontario general practices. Glass ionomer cements serve specific applications such as interim restorations and cervical lesions. For large posterior restorations where longevity is critical, indirect options including ceramic inlays, onlays, and zirconia restorations offer excellent long-term performance.
EBIKO Dental will continue monitoring Health Canada's position on dental amalgam and the practical implications of global mercury regulations for Ontario dental practices. For the latest updates, visit ebiko.ca.