The first molar is generally referred to as the first molar, which is a tooth that is not replaced. The average person’s first milk tooth erupts from 6 months of age and all twenty milk teeth are erupted by the age of 3 years. Any new tooth that erupts after that is a permanent tooth and will not be replaced by any other tooth. However, one very special tooth, the first molar, also known as the sixth tooth, begins to erupt when a person is about 6 years old. It does not replace any of the teeth, but starts to erupt at the end of the milk tooth row. This means that the sixth molar is a permanent tooth, but it does not replace the milk tooth, it grows directly out. It is the most important tooth in our mouth and must be protected.