Some extra info from Elle of Live Laugh Love Soap. Very interesting!!!
"Toothbrushing Soap is not just ordinary cold process soap, which can contain any number of food grade and inedible oils. Toothbrushing Soap is manufactured with a base of food grade Olive Oil and Sesame Seed oil, which are paramount in pulling toxins and cleansing tooth decaying bacteria from enamel, gums and tongue.
Tea tree oil is often added to the mixture to aid in teeth whitening and killing bacteria. The defining ingredient that separates Toothbrushing Soap from your every day handmade cold process soap is Arm & Hammer Baking Soda. Baking Soda scrubs and cleanses thoroughly, massaging your gums and removing bad odors that contribute to bad breath and gingivitis. Lemon essential oil is added to liven the taste buds, as well as continue to fight against infection and work as an antiseptic (extremely important in oral hygiene)."