Which stage follows the cap stage in the sequence of tooth development?

• A. Initiation
• B. Bud
• C. Cap
• D. Bell

Answer: (D)

Understanding the sequence of tooth development helps you see how a tooth forms its crown. After the cap stage, the next phase is the bell stage. In this stage the enamel organ takes on a bell-like shape and cells begin to specialize (histodifferentiation and morphodifferentiation). The inner enamel epithelium differentiates into ameloblasts that will form enamel, while the dental papilla cells become odontoblasts that lay down dentin. The enamel organ also organizes into its four layers—inner enamel epithelium, stellate reticulum, stratum intermedium, and outer enamel epithelium—setting up the structure for enamel and dentin formation. The surrounding dental sac contributes later to cementum and the periodontal ligament. So, the bell stage is the next step after the cap stage because it introduces detailed cellular differentiation and crown shape that drive subsequent hard tissue formation.