According to WebMD, dandruff does not cause hair loss. The causes of hair loss and dandruff are entirely distinct, but the two often appear together, especially in men.
According to WebMD, it is important for men who are prone to dandruff to wash their hair on a regular basis, either once a day or once every two days. Many men, however, avoid washing their hair every day due to the false belief that less hair falls out with less frequent washing. In fact, the frequency of hair washing has little impact on hair loss and can only cause dandruff to worsen.