Natural hair loss will occur, which will help to remove the damaged follicles. A hair cycle lasts about four months. Hair is always unstable in 5 to 10% of the population. Pollution, humidity, stress, sleep, food, and other things all affect it. Approximately 5% to 10% of hair is always in the process of falling out. The natural hair fall percentage may grow or decrease in subsequent cycles, depending on the circumstances.