Unsavory taste of the foaming agent is used in most toothpastes. Sodium lauryl sulfate reduces the taste buds responsible for sweet. This means that the orange juice and everything else that you'll eat or drink immediately after brushing, won't be sweet.Furthermore, sodium lauryl sulfate destroys phospholipids which normally prevent bitterness be too strong. Therefore, not only toothpaste muffles sweetness of orange juice, but also enhances its bitterness. Both of these effects create a disgusting taste.