People have as many as 150,000 hairs on their heads. Each one goes through precisely three phases: growth, transition and resting. After the resting phase, the hair falls out, but don't worry: each hair that falls out is nearly always followed by another hair growing in. To protect your hair during styling, you should use a hair dryer that preserves the sensitive protein keratin, the main building block of hair. For example, the BrilliantCare KeratinAdvance hair dryer from Bosch.