"Functional" abnormalities that don't require treatment.
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“No treatment is needed with observed pathology where there is a ‘functional’ abnormality (even though the dentition is not ‘normal,’ the animal does not derive adverse effects). Examples of functional abnormalities include an enamel chip that does not penetrate the dentin sufficiently to affect the pulp and where radiographs do not show pathology. Other cases where no treatment is the best course include functional malocclusions, and cases where the root of a tooth shows external resorption that does not extend to the crown.”
-Jan Bellows, DVM, DAVDC, DABVP
From Explore the options for dental treatment plans