How does the pH value of shampoo and conditioning products used affects the hair structure?

The pH value of shampoo and conditioning products can impact the hair structure by affecting the cuticle layer. Products with a pH close to the hair's natural pH (4.5-5.5) help keep the cuticle smooth and intact, resulting in softer and shinier hair. Products with a higher or lower pH can cause the cuticle to swell or contract, leading to dryness, breakage, and dullness.