Pour and measure your desired oil or serum into the therootbottle. Once your chosen mixture and amount are in the therootbottle, secure the comb lid. Proceed to put the comb in the selected area of your scalp and squeeze the bottle allowing the oil to flow through the comb. For best results use two to three times a week ! You are welcome to use any mixtures of oils/Serums in the bottle that you prefer for your hair