Most natural toothpastes contain some kind of synthetic surfactant, whether it's SLS or one of its related, lesser known relatives, e.g. sodium cocyl glutamate. To avoid these surfactants the best thing to do is make your own tooth powder by mixing 3 parts baking soda to 1 part salt. Your mouth will feel really fresh! And it's always better for a sensitive body to make your own fresh products just like it's better to make your own fresh food.Coconut oil is used as the raw material for many surfactants because it is cheap and readily available. They take the coconut oil and add anywhere from 10 to 100 other chemicals until they come out with something that foams up really easily and is in no way as pure as the coconut oil that they started with.  I studied chemical engineering in college and it was really shocking to learn what goes into our personal care products. The list of ingredients on the box, little shop of horrors that it may be, doesn't give you the full picture. For instance, before a tooth paste manufacturer can make a 1,000 gallon batch of toothpaste in one of its stainless steel vats, its has to "clean" the line by running degreasers and all sorts of other chemicals through it. Of course it rinses these out with water, but obviously trace amounts of these chemicals get into the product. Like Matia says, you can't avoid all of these toxins no matter how vigilante you are. But knowledge is power.