Final answer:
Toothpastes, shampoos, and personal care products contain sodium lauryl sulfate (SLS) as a foaming agent. Some 'natural deodorant crystal' products contain potassium alum or ammonium alum. Concerns have been raised about the aluminum content in these products.
Step-by-step explanation:
Toothpastes, shampoos, and various personal care products contain sodium lauryl sulfate (SLS) or related surfactants. Toothpastes, shampoos, and personal care products contain sodium lauryl sulfate (SLS) as a foaming agent. Some 'natural deodorant crystal' products contain potassium alum or ammonium alum. Concerns have been raised about the aluminum content in these products.
These substances are mainly used as foaming agents to improve the distribution and cleansing power of the products. Additionally, some over-the-counter products labeled as 'natural deodorant crystal' contain potassium alum or ammonium alum, which prevent bacterial action on sweat. However, it's important to note that there are concerns about the possible risks related to aluminum in these products.