It is possible for hair to grow back after being uprooted. Whether or not hair grows back after being uprooted depends on whether or not there is necrosis of the scalp follicles. If the scalp follicles are not necrotic, then the hair will grow back. If the scalp follicles are necrotic, then the hair will not grow back. In daily life, the hair may be pulled out from the scalp by external force and the hair root may be pulled out, causing damage to the scalp. Whether or not hair grows out of the scalp depends on the survival of the hair follicles. If the follicles are still active, then new hair will grow, but if the follicles are closed and necrotic, then no new hair will grow. In order to protect the scalp, to avoid hair loss, in daily life should try not to pull the hair, in order to prevent hair follicle damage.