According to a Dietitian

Glycerin A natural ingredient derived from vegetable oils and a byproduct of soap production glycerin is added to toothpaste to create a pleasant texture and add that slippery mouthfeel. Toothpaste analysis Glycerin and propylene glycol PG are widely used in toothpaste. Julie Ola Blog 10 Dangerous Toothpaste Ingredients Glycerin is also used as solvent antifreeze and lubricant. Glycerin in toothpaste . Additionally the surfactants and abrasives present in the toothpaste formula plus the brushing mechanism would remove any glycerin. It can help reduce bacterial activity by reducing the available water activity and therefore has a protective action against tooth decay. It is even used in toothpaste since it does not feed the bacteria in. However some people may have allergies to glycerin. It can be dissolved into water or alcohol but not oils so it is a good solvent. Hence it is used in toothpaste to create that smooth texture most people are so fond of. Glycerin PG