No, shaving does not make hair grow back thicker or darker. This is a common myth that has been debunked by science. Hair growth is determined by genetics and hormones, and shaving does not affect either of these things.
When you shave, you are only cutting the hair shaft at the surface of the skin. The hair follicle, which is the part of the hair that produces new hair, is located beneath the skin and is not affected by shaving.
After shaving, the hair may appear thicker or darker because the blunt ends of the hairs are more noticeable. However, this is only a temporary effect. As the hair grows back, it will return to its normal thickness and color.
There is no scientific evidence to support the claim that shaving makes hair grow back thicker or darker. This myth may have arisen because the hair can feel stubbly and coarse after shaving. However, this is simply because the ends of the hairs are blunt. As the hair grows back, the ends will soften and the hair will return to its normal texture.
If you are concerned about hair growth, you should talk to your doctor or dermatologist. They can help you determine the best way to manage your hair growth, based on your individual needs.