One of the primary concerns associated with side effects of smoothening hair smoothening is the utilization of potent chemical compounds, typically formaldehyde or its derivatives, to achieve the desired results. These chemicals work by breaking down the natural protein bonds within the hair shaft, allowing for reshaping and straightening. Despite their efficacy in producing smooth, frizz-free hair, formaldehyde-based solutions can trigger adverse reactions in some individuals, ranging from mild irritation to severe allergic responses. Prolonged exposure to formaldehyde vapors during the treatment process may lead to respiratory distress, eye irritation, and skin sensitization, posing significant health risks to both clients and salon professionals.