Why was TPO banned for cosmetics and not dentistry?
Why was TPO banned for cosmetics and not dentistry?
The September 2025 TPO prohibition has created significant operational and financial challenges for nail professionals across the EU. As experienced technicians, we've witnessed the immediate discontinuation of proven formulations that have been integral to our service offerings for years, while simultaneously observing that other professional sectors continue using the identical ingredient without disruption.
This regulatory inconsistency raises legitimate questions about the scientific rationale and policy framework underlying these sector-specific restrictions. For nail technicians managing substantial inventory transitions and client expectations, understanding the regulatory mechanics becomes essential for strategic business planning.
TPO banned only in cosmetics—all other professional uses remain legal
TPO remains fully compliant and legally utilized across multiple professional sectors. TPO remains legal in industrial and medical applications, including printing, coatings, electronics and dental materials, despite its prohibition in cosmetic applications effective September 1, 2025.
Professional sectors maintaining TPO authorization:
- Dental applications: TPO is used in dental resin composites and dental fillings
- Industrial UV-curing systems and protective coatings
- Commercial printing and lithographic applications
- Food-contact packaging materials
- Industrial adhesive systems
- Electronic component manufacturing
The regulatory divergence creates a situation where identical chemical compounds receive disparate treatment based solely on application category, not inherent safety characteristics.
Scientific basis for the cosmetic prohibition
The prohibition stems from administrative classification rather than empirical evidence of harm within professional nail services. TPO was classified as a CMR category 1B reproductive toxicant by Commission Delegated Regulation (EU) 2024/197 under the CLP Regulation. This classification triggered the mandatory inclusion of TPO in Annex II (prohibited substances) of the Cosmetics Regulation.
Critically, TPO came under scrutiny not because of skin contact, but because of its potential reproductive toxic effects when ingested in high concentrations. The underlying toxicological studies involved oral administration to laboratory animals at doses significantly exceeding any conceivable exposure scenario in professional nail applications.
This disconnect between research methodology and real-world professional practice represents a fundamental challenge in translating laboratory findings to regulatory policy affecting skilled practitioners.
Regulatory framework disparities
The differential treatment of TPO across professional sectors reflects distinct regulatory philosophies rather than evidence-based risk assessment:
Administrative automaticity vs. professional discretion
The REACH Regulation (Regulation (EC) No 1907/2006) is a different legal framework. It allows for socioeconomic analysis and long transitional periods based on enforcement feasibility and supply chain adaptation. The Cosmetics Regulation does not include such provisions; its primary objective is the protection of human health.
Under cosmetics legislation, for CMR 1A/1B substances, a ban is automatic unless an Article 15(2) derogation is granted. This mechanistic approach eliminates professional judgment and contextual risk assessment that other sectors retain.
Hazard identification vs. exposure assessment
The EU takes more of a hazard-based approach to regulation than the U.S. Essentially, that means it tends to regulate chemicals based on their "inherent properties" as opposed to risks based on how the chemical is used in the real world.
This methodology ignores professional competency, controlled application environments, and established safety protocols that characterize legitimate nail service operations. The CLP (Classification, Labelling and Packaging) regulation classifies chemicals by highest hazard, regardless of their use, effectively negating professional expertise and risk mitigation practices.
Economic implications for professional practitioners
The EU is strict on cosmetics and is applying a precautionary measure in this case, implementing policy that transfers substantial compliance costs to individual business operators rather than considering proportionate risk management approaches.
The regulatory timeline provided minimal transition period for inventory management or alternative product validation. The SCCS did conclude in 2015 that TPO was safe in certain professional UV-cured nail gels up to 5% under specified conditions. However, this opinion predates the new CMR classification, that upgraded the classification from Cat.2 to Cat.1.
This progression demonstrates how administrative reclassification can supersede scientific safety assessments specifically developed for professional applications.
Industry advocacy and regulatory engagement
A significant factor in the current situation involves industry representation during the regulatory development process. Nobody submitted a derogation request for TPO before the adoption of Regulation (EU) 2025/877 (ed. this means the ban was AVOIDABLE), indicating potential gaps in industry advocacy or underestimation of regulatory impact.
Professional associations, nail industry experts and nail product brands might consider this experience instructive for future regulatory engagement, particularly regarding early intervention in classification processes and comprehensive documentation of professional practice standards.
Professional competency recognition
The fundamental issue extends beyond TPO to broader questions of professional recognition within regulatory frameworks. Dental professionals continue utilizing TPO under medical device regulations that acknowledge professional competency and permit risk-benefit analysis. This recognition contrasts sharply with cosmetics regulations that apply uniform restrictions regardless of professional qualification or operational context.
For nail technicians, this disparity suggests an underlying regulatory assumption that our professional capabilities differ from those of other healthcare and technical practitioners utilizing identical chemical compounds.
Strategic considerations for practice management
While challenging current regulatory decisions, nail professionals must simultaneously adapt to operational realities. This includes comprehensive documentation of transition costs, systematic evaluation of alternative formulation performance, and development of client communication strategies addressing product changes.
Professional development opportunities may include enhanced chemical safety training, regulatory compliance education, and advocacy skill development to strengthen industry representation in future policy discussions.
The TPO prohibition exemplifies broader tensions between precautionary regulation and professional practice autonomy. Understanding these dynamics positions nail technicians to engage more effectively with regulatory processes while maintaining service excellence during transitional periods.
