Hazard and risk: why the words are different

Potential versus circumstances

EFSA’s glossary distinguishes hazard from risk in its food-safety terminology. The distinction is useful for understanding general scientific language: a potential for harm is different from a conclusion about likelihood in a particular situation. Applying those words to nail materials does not turn the glossary into an assessment of a specific ingredient. [1]

Irritation, sensitisation and allergic reaction

Irritant contact dermatitis results from damage to the skin barrier when irritants injure it faster than it can repair itself. Sensitisation is different: the immune system develops a specific response to an allergen. Subsequent contact can then trigger allergic contact dermatitis, a delayed immune reaction. DermNet notes that irritant and allergic dermatitis can coexist, so appearance alone does not reliably distinguish them. [2] · [3]

HEMA illustrates sensitisation in nail-product chemistry. Regulation 2020/1682 identifies HEMA and Di-HEMA as sensitisers and links foreseeable skin contamination to sensitisation risk. Its professional-use and allergy-warning requirements are restrictions, not a promise that professionals cannot develop an allergy. [4]

DermNet explains that acrylate allergy is investigated through medical patch testing. Applying uncured gel or a monomer directly to skin as a home test can itself cause sensitisation; it is not an alternative diagnostic method. “HEMA-free” or “TPO-free” identifies an ingredient claim, not an allergy diagnosis, immunity to all ingredients or permission to ignore product precautions. [5]

What a risk statement needs

A meaningful risk statement identifies the situation it addresses. Exposure information is relevant, alongside the nature of the hazard and the scope of the assessment. A bare “high” or “low” without that context hides what was considered. This explanation does not assign categories, thresholds or acceptable levels to salon activities. [1]

Reading confident claims

Our reading: “Hazardous”, “low risk” and “safe” do not communicate the same information. Before treating a claim as evidence, identify its subject, context and source. Hazard and exposure are not combined here into a universal numerical formula. Product-specific decisions need the relevant assessment and documentation, not an interpretation based only on a reassuring adjective.