Namely
Steareth-30 is a polyethylene glycol ether and stearic acid ether. It is a nonionic surfactant with a waxy appearance. It is mainly used in toothpastes in cosmetics.
Its functions (INCI)
Cleansing : Helps to keep a clean surface
Gel forming : Gives a liquid preparation the consistency of a gel
Surfactant : Reduces the surface tension of cosmetics and contributes to the even distribution of the product when it is used