What effects do colouring have on the hair structure?

Coloring hair can alter its structure by opening the cuticle layer to allow dye penetration, which can lead to increased porosity. This process may weaken the hair, making it more susceptible to damage, dryness, and breakage over time. Additionally, chemical ingredients in hair dyes can strip natural oils and proteins, further affecting the hair's strength and elasticity. Regular coloring may necessitate additional conditioning and care to maintain hair health.