Toners balance your skins pH, and balancing your skin is an essential step to ensure your high performance products and active ingredients are able to perform to their full capacity. If your skin is too alkaline you will likely experience flakiness, and if it is too acidic, you may experience more oil production. Quick tip: every time water touches your face, tone your skin! Water is a 7 on the pH skill, while your skin is happiest at about 5.5