The waxing hair removal process generally doesn't make hair thinner. However, according to BlogHer, waxing regularly can make hair less coarse when it grows back. Waxing doesn't cause hair to grow more follicles, so it doesn't become thicker if it is waxed.
Waxing also doesn't cause any change in the color of a person's hair, just as hair color doesn't become darker after a haircut. It is possible to develop ingrown hairs from waxing, BlogHer states. This is because the skin becomes thicker and harder after waxing. To prevent ingrown hairs, one should exfoliate the skin thoroughly and gently after waxing.