The first adult tooth that begins to appear in the mouth without any baby tooth falling, is the first molar, or commonly called “the six year old tooth”. As the name suggests, the permanent tooth is intended to remain in the mouth during the person’s whole lifetime. The other permanent teeth will erupt replacing primary teeth and this replacement phenomenon will continue until the age of 12-14 years. These newly erupted teeth are more yellow than the primary teeth due to their constitution. They have thinner and more fragile enamel which is why the addition of fluoride is highly recommended to solidify them. In addition, these teeth also have many deep pits and fissures and it is preferable to protect these with dental sealants.