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14. Alterna Clinical Densifying Leave-In Root Treatment
This leave-in treatment helps stimulate the scalp, allowing your hair to grow in thicker and healthier. The root treatment builds a defense against product build-up that clog follicles, making sure you don't have any unnecessary hair loss. If you want denser hair, this overnight treatment can help.

Alterna Clinical Densifying Leave-In Root Treatment, $38, Sephora