The reason for homemade toothpaste is to get away from all the harmful additives and preservatives that are generally added to regular toothpaste. Sodium Laurel Sulphite is a sudsing agent used in any product that bubbles eg: soap, shampoo, toothpaste, bubble bath, laundry soap, and I have seen it in some foods ( I am not sure why this would be added....is it to de-grease your insides??). This sudsing agent, in its pure form can actually burn the skin and the commercial use is to de-grease airplanes This is usually the second ingredient in most sudsing products. People who have sensitive or dry skin that is constantly irritated may not be aware of this product. If you are having problems finding the Myrrh Gum Powder, leave this out and add 30 drops of pure Tea Tree Oil, leaving the Peppermint out. (Please realize the computer could not recognize this) Watch the grade of the eso you buy....you do want Pure Tea Tree Oil for this application. Some of the cheaper brands are diluted with Jojoba Oil, but this will be printed on the bottle. This toothpaste does take some getting use to, but in the long run your teeth and mouth are going to thank you. Since I have been using this paste my teeth are clean and white, the plaque is down, I do not get mouth ulcers, my breath is clean, my colds are down and my general health has improved. Can't ask for anything better than that!