Which category of the synthetic detergents is used in toothpaste ?

Explanation

**Step-by-Step Solution:**

1. **Identify the Category of Synthetic Detergents**: The question asks about the category of synthetic detergents used in toothpaste. The relevant category is anionic detergents.

2. **Examples of Anionic Detergents**: Common examples of anionic detergents used in toothpaste include sodium lauryl sulfate and sodium dodecyl benzene sulfonate.

3. **Function of Anionic Detergents in Toothpaste**: These detergents are responsible for cleaning teeth. They create foam, which helps to carry away debris and food particles from the teeth.

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