Every day, we lose an average of 50 to 100 hairs. It is when this average is exceeded that we speak of hair loss. This can be temporary or irreversible (we talk about alopecia). Temporary hair loss can occur as a result of emotional shocks, hormonal changes, stress, pollution, or the frequent use of hair coloring or straightening. It also occurs when there are vitamin and mineral deficiencies. But how can it be avoided? In order to fight against reactive hair loss, it is important to adapt your hair routine by following the principles of In and Out beauty.