Hair Damage due to UV Irradiation: —Early Indicator of Photo-Damage—@@@—評価指標とダメージケア—

Abstract

We have become aware of UV protection for skin in recent years. However we haven ’ t been aware of it for hair. Hair is easily exposed to UV, because hair is different from skin in that it doesn ’ t suffer such reactions such as a hot flash or a slight redness. In fact hair is damaged by sunlight slightly in daily life, and this leads to perceptible heavy damage such as split hair ends, broken hairs and a dry feeling. To maintain and preserve non-damaged healthy hair, we believe it is necessary to protect hair from UV exposure in daily life, and prevent the accumulation of damage to hair. In this paper we discuss hair damage due to UV irradiation, a detection method for early stage modification and technology for protecting hair from UV exposure in daily life.