There are differences between the baby teeth and the permanent teeth. The permanent teeth are made up of parallel crystals so that the teeth are yellower in color. The yellow dentine can shine through with light. The enamel of the milk teeth is less transparent because the teeth do not consist of parallel crystals.
The enamel of the milk teeth is thinner than and not as strong as the glaze of the permanent teeth. This means that the chance of wearing out the glaze and holes is greater. The permanent teeth differ in shape and size. The permanent (angle) teeth are larger than the milk and canine teeth of the milk teeth. In addition, permanent lower teeth often have a serrated edge. Due to chewing movements, these edges will wear out slowly. The new permanent molars are smaller than the milk chooses. The big ones that pass through them have deeper grooves than milk chooses. These grooves are difficult to keep clean and increase the chance of holes. To prevent this, a white synthetic resin layer is applied and sealed in the grooves. This reduces the chance of cavities.