Which product should be avoided if a client has a history of allergies?

When considering which product to avoid for a client with a history of allergies, gel nail polish is the most prudent choice. Gel nail polish contains a variety of chemical components, including acrylates and methacrylates, which are common allergens for some individuals. These substances can trigger allergic reactions ranging from mild irritation to severe responses in susceptible clients.

Clients with known allergies may not have adverse reactions to standard top coats or base coats, as these products generally have fewer reactive ingredients. Nail hardeners can also vary in formulations, and while some contain harsh chemicals, many do not pose the same level of risk as gel products. Therefore, opting for gel nail polish is particularly concerning if there is any question about a client's allergies, making it the best option to avoid in this scenario.