Scalp hygiene will affect the quality of your hair. If the follicle opening is clogged, it’s difficult for new hair to grow out. To that point, Hill recommends applying a pre-shampoo scalp oil to open the follicles, encourage cell turnover, and increase circulation. ... Follow that by using a shampoo dedicated for thinning hair, like Foligain Stimulating Shampoo for Thinning Hair."