Originally Posted by SkyDog75

Are you sure the chainring is worn? If you're making that assumption based on teeth that are shortened or rounded, you're probably looking at teeth that are shaped to aid upshifting. You'll see these specially-shaped teeth on the outer ring (and the middle on a triple), but not on the inner ring. The inner ring doesn't need shaped teeth to aid upshifting since you don't upshift to the inner ring.