Which teeth in human being are replaced by permanent teeth?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Types of Teeth**: In humans, there are two main types of teeth: milk teeth (also known as deciduous or primary teeth) and permanent teeth.

2. **Milk Teeth Characteristics**: Milk teeth typically emerge in children around the age of 3. A child usually has a total of 20 milk teeth.

3. **Replacement Process**: As children grow, usually around the age of 5 to 6 years, the milk teeth begin to loosen and eventually fall out.

...