Why do common household items (shampoo, toothpaste, medicine, etc.) have expiration dates and what happens once the expiration date passes?

Question

Why do common household items (shampoo, toothpaste, medicine, etc.) have expiration dates and what happens once the expiration date passes?

In: Other

Answer 1

A lot of items like shampoo toothpaste and household things are a homogeneous because they use substances that stabilize it. Oil and water don’t like to really mix but shampoo is basically water, soap, and oils (to prevent dry hair) and conditions is basically water with oil. They use the stabilizes to make sure it comes out nice and one substance. Overtime they break down and cause the item to separate so you will have oil on the top and water on the bottom. The date is usually before this happens.