Which tooth has five cusp tips, but not all are functional?

The maxillary first molars are characterized by having five cusp tips: three major functional cusps (mesiobuccal, distobuccal, and mesial lingual) and two smaller accessory cusps (the distal lingual and the carabelli cusp). The carabelli cusp, while present, is often smaller and not considered a functional cusp in the same sense as the major cusps, which are critical for the mastication process and occlusion.

Therefore, the maxillary first molar is the best answer to the question since it distinctly features five cusp tips, with only three of those being fully functional for chewing and grinding food. Understanding the anatomy of the maxillary first molar is essential for recognizing its role in dental procedures and tooth development, making it a relevant topic for Expanded Function Dental Assistants.