Is it truly necessary to wash my hair before undergoing a keratin treatment? This seemingly simple question might unravel a plethora of considerations that many may overlook. For instance, one might wonder whether washing the hair will strip it of essential oils that keep it nourished and protected, or if it could possibly enhance the absorption of the keratin solution applied during the treatment. Could the condition of my hair prior to the treatment affect the final outcome? What if my hair is laden with product residue or buildup; would this interfere with the process? Additionally, do different hair types dictate different preparatory steps? Is there a recommended timeframe for washing the hair before the treatment, or does this vary based on individual circumstances? Could the temperature of the water I use to wash my hair play a significant role? Considering all these aspects, what is the consensus among hairstylists and industry experts?