Linked from
The 12 pages that link to Tooth replacement, each with the reason it gives.
RadulaNarrower topic: The radula advances new tooth rows as older rows become worn.
IchthyornisRelated: Ichthyornis had teeth in its jaws, unlike living birds.
GorgonopsRelated: Replacement could maintain functional teeth despite the wear of predation.
HelicoprionRelated: Helicoprion’s spiral records successive teeth rather than a single fixed row.