Clients may be unsure about which products or activities to avoid before a treatment to prevent irritation or adverse reactions. Advising clients to avoid exfoliating products, harsh cleansers, or certain medications (like retinoids) before treatments like waxing or peels can help prevent skin sensitivity. Additionally, informing clients to avoid alcohol or caffeine before certain treatments can reduce the risk of increased sensitivity or bruising. Providing a list of irritants to avoid before their appointment helps clients prepare properly and reduces the risk of complications.