The shampoo contains cleaning agents, natural or chemical.
Choose the one with the least, if any, oil, phosphates and salt. During its action, while gently massaging, it will open the cuticles of your hair to wash them well.
A good shampoo should contain keratin and moisturizing oils, according to your hair type, to avoid drying and weakening the hair.
Washing your hair should be a time of pleasure, relaxation and health.