In a word, No.
Chainrings rarely have to be replaced. If you replace your chain at reasonable enough intervals, depending on its wear, you'll probably never need to replace the chainrings. Only reason to replace the rings is if the new chain skips on the chainring teeth.
Chainrings have more teeth to engage the chain at a given time, and since they have more teeth than a rear sprocket, the angle of difference between teeth is much less also.
Steel chainrings are virtually indestructible, but aluminum chainrings rarely wear out if the bike is cared for properly.
There are instances where chainring teeth get worn out, like on my brother's bike where he rode over 10,000 miles without ever changing his chain and probably not cleaning or lubing it as often as he should have either. Just ridiculous.
Last edited by TallRider; 02-19-09 at 01:08 PM.