The examples I posted shows normal wear. The wear I mentioned was buccal aspect of the crown. (not the root) On a human, the tooth would be displaying the pulp chamber from the crown. We need another angle to show the extreme wear at the top aspect of the tooth. To view it from the front would show an angle of wear. The top most portioin of the crown wears the most extreme. The bottom of the crown the least.
I'm not savy enough to point that out on a computer. Particularly now with no example shown.
The original pictures are from Murray Fowlers old veterinary books (I believe) and are displayed at least 2 places on the web.