Final answer:
Initial caries of enamel in pits and fissures are shaped as an Inverted V-shape, with the base towards the dentino-enamel junction, and its early treatment is crucial to prevent further dental issues.
Step-by-step explanation:
The shape of initial caries of enamel in pits and fissures is an Inverted V-shape (base towards dentino-enamel junction). This shape allows the caries to spread outwards as it progresses towards the surface of the tooth. Early detection and treatment of dental caries are important as they can further advance to affect the dentin and the pulp cavity, potentially leading to severe dental problems such as tooth abscesses.