Damaged hair scatters light, leaving it dull
When hair is exposed to extreme temperatures, pores can begin to form within the strands. Light hits these pores and scatters in all directions. This can reduce reflected light, decreasing shine.
Hair that’s less damaged is better at reflecting light, making it shine
The Dyson Supersonic™ hair dryer uses intelligent heat control to prevent it reaching extreme temperatures, protecting against overdrying. Less damaged hair reflects more light in a single direction, helping it to appear shiny.