Explain the oral development process.

Tooth mineralization begins around 3 to 4 months of embryogenesis. The primary teeth begin forming at 6 weeks in utero. At this point, the cells differentiate to form the dental lamina, and crown formation begins with a dentin matrix containing collagen fibrils. Minerals such as calcium and phosphorus enter the matrix and form small crystals on or between the collagen fibrils. After this first dentin layer is complete, enamel formation begins, and continues after the matrix is formed. Mineralization begins as early as 4 months in utero and continues into late adolescence. At birth, the crowns of the primary incisors are almost completely formed, and the primary canines and primary first molars are one-third to one-half formed. Crown completion of the second primary molars occurs approximately 1 year after birth. Once the tooth erupts into the oral cavity, mineralization continues throughout life topically from saliva, food, fluids, dentifrices, oral rinses, etc. There are two major distinctions between the mineralized tissues of the teeth and other body tissues.