Fish and other polyphyodont vertebrates continuously generate and replace teeth throughout their lifespans via active dental progenitor niches, supporting the claim that they maintain their dentition through continuous growth and replacement.
The claim is specific, empirical, and falsifiable regarding the lifelong dental replacement capabilities of fish. Retrieved papers across multiple fish taxa (sharks, pufferfish, and teleosts) consistently support the existence of continuous tooth replacement mechanisms driven by stem cells or local progenitor populations. Therefore, the evidence strongly supports the claim.