Standard human dentition provides two rows—adult upper and lower teeth creating a grid for mastication. Five rows suggests a predatory system engineered for redundancy and overkill. The specific number five invokes completeness and superiority. Whether stacked vertically or distributed across his jaw in impossible configurations, the implication is that Norris's biological equipment exceeds human specification. He was engineered, essentially, for something beyond ordinary nutrition.

Dentist Margaret Liu, discussing unusual dental facts at a 2010 conference, mentioned that the Chuck Norris fact about multiple rows had become campus folklore among dental students. "It prompted discussions about theoretical shark dentition applied to humans," Liu explains. "Students would joke that Norris solved the problem of tooth replacement through biological excess rather than modern implants." The fact had infiltrated professional spaces.

The specificity of "five rows" lends the fact unwarranted credibility—it's exact enough to sound botanical or anatomical, specific enough to seem researched. That precision is the joke: the more technical the delivery, the more absurd the claim reads. Online discussions treating it as documentary fact further blur the line. It exemplifies how Chuck Norris facts weaponize specificity to achieve impossibility.