Why should wax temperature be checked before applying it to a client's skin?

Wax temperature must be checked before application to prevent burning the client's skin — wax that is too hot can cause painful burns. The cosmetologist tests the temperature (for example, on their own wrist or per the manufacturer's guidance) and applies wax that is comfortably warm, not hot. Burns from overheated wax are a real and avoidable injury. Checking temperature before every application is a basic, important safety habit in hair-removal services and is the kind of practical safety point assessed on the exam.