Are you experiencing any specific problem at the moment? I'd expect that you'd be more likely to make things worse rather than better unless there's a specific and clear problem you can identify (like getting a bent tooth straight again). When my chain rings have gotten worn they have been very sharp - i.e. 'shark's teeth.'
OTOH, slightly worn cogs can frequently be improved by removing the little hook that forms on the back side of each tooth and letting a new chain settle properly on the worn cog rather than hanging up on the hook and then skipping.