A first molar usually has how many roots?

A first molar typically has multiple roots to accommodate its function in grinding food and maintaining stability in the dental arch. Specifically, in humans, the upper first molars generally possess three roots: two buccal roots (the mesiobuccal and distobuccal) and one palatal root. This configuration allows for a greater surface area for the attachment of periodontal ligaments and provides the structural support needed to withstand the forces of chewing.

On the other hand, the lower first molars usually have two roots: one mesial root and one distal root. This design helps in anchoring the tooth securely while enabling effective mastication. The combination of these factors leads to the conclusion that the answer encompasses the typical root structure for both upper and lower first molars, making it the most comprehensive and accurate response.