It takes about 4 to 8 weeks for eyebrows to grow back after shaving, and some measures can be taken to promote eyebrow growth. Eyebrows and other parts of the body hair is the same, its hair follicle growth also go through the growth phase, regression, resting phase three stages. In general, the anagen phase can see the growth of hair within the follicle, and the hair within the follicle may fall off after entering the anagen and resting phases. To summarize, eyebrows in the anagen phase follicles will continue to grow, but eyebrows in the degenerative and resting phase follicles will grow slower and even fall off, and it will take 3 to 9 months for the latter two phases to grow again. However, shaving the eyebrows will stimulate most of the eyebrow hair follicles to shift to the anagen phase. The growth rate of eyebrow hairs in the anagen phase follicles is every 0.16mm, and the normal length of eyebrow hairs is about 5-8mm, so it takes about 4-8 weeks for the eyebrow hairs to grow out completely. In addition, some measures can be taken to help promote eyebrow growth, such as strengthening physical exercise, stimulate androgen secretion, thus helping to promote eyebrow growth; pay attention to maintain a relaxed mood, develop a good habit of regular rest and relaxation, to stabilize the level of various hormones in the body, which will help eyebrow growth, and so on. It should be noted that, if the eyebrows after shaving delayed growth, it is recommended to go to the regular medical institutions in a timely manner, to exclude other diseases caused by hair growth difficulties, so as to avoid delays in treatment.