What is the effects and colouring and lightening products have on the hair structure?

Coloring and lightening products can significantly alter the hair structure by breaking down the natural melanin pigments. These products often contain harsh chemicals, such as ammonia and peroxide, which can weaken the hair's protein structure, leading to dryness, brittleness, and potential breakage. Over time, repeated use can cause cumulative damage, resulting in loss of elasticity and shine. Proper aftercare, such as using moisturizing treatments, can help mitigate these effects.