A Hair has a certain life cycle, so hair is not growing indefinitely. There is growth period and pause period (which means you have to say goodbye to your hair). About 85 – 90 % of the entire hairs on your head is in the growth period, and 15 – 10 % of the hairs in the pause period.  The depth of these hair roots is approximately one third of the hairs in the growth period. These hairs become thinner and thinner and eventually fall of. However, each hair has its own cycle, so all the 15 – 10% of hairs in the pause period are not going to fall off all together.  Therefore, an average person loses 50 – 100 of his/her hairs a day.