Humans begin teething as early as 6 months of age and develop their set of primary milk' teeth. Humans begin to lose their milk teeth around the age of 6-7 years, and the permanent set of teeth begins to emerge. Because milk teeth eventually fall out, some parents avoid taking their child to the dentist. However, these milk teeth serve as the foundation for the development of permanent teeth. If proper care is not taken, problems that will last a lifetime may arise.