INBDE (Integrated National Board Dental Examination) Practice Exam

The third stage of tooth development is known as the bell stage. This is when the cells in the tooth begin to differentiate and form distinct layers, including the outer enamel layer and inner dentin layer. Option A, root formation, takes place during later stages of tooth development. Option C, crown polishing, is a part of dental care and not a stage of tooth development. Option D, cap formation, is not a recognized stage in tooth development.