The main ingredients in most regular toothpastes are potentially harmful and can irritate gums, mouth tissue, and sensitive teeth. The United States FDA (Food & Drug Administration) has mandated that all fluoride toothpastes sold in the U.S. carry a poison warning on the label. This is especially alarming because many types of toothpaste are artificially flavored to appeal to children, with some even tasting like candy. And even if the toothpaste isn’t swallowed, potentially harmful ingredients can be absorbed through mucosal lining.