Phenol-croton oil peel is one of the most effective techniques for deep facial rejuvenation, with proven efficacy in the treatment of static rhytids, advanced solar elastosis, constitutional periorbital hyperpigmentation, acne scars, refractory melasma, and premalignant lesions, including actinic keratosis, Bowen’s disease, and actinic cheilitis. Clinical and histological studies confirm its superiority over medium-depth peels, ablative lasers, and other modalities, with long-lasting results and high patient satisfaction. Segmented techniques and individualized formulations allow adjustment of depth according to anatomical region and phototype, thereby increasing safety even in darker or Asian skin types, provided there is appropriate preparation, careful patient selection, and specialized management. On the other hand, this is a deep ablative procedure with the potential for systemic toxicity and significant local complications, making it essential to strictly observe its contraindications. Absolute contraindications include unstable cardiovascular disease, uncontrolled arrhythmias, severe hypertension, hepatic or renal insufficiency, decompensated diabetes, severe autoimmune diseases, immunosuppression, history of abnormal scarring, frontal fibrosing alopecia, active infections, pregnancy, breastfeeding, malnutrition, active smoking, and severe psychiatric disorders. Proper patient selection, prior cutaneous preparation, and performance by trained medical professionals are crucial to maximize aesthetic benefits and minimize risks.