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Thanks a lot!
If you can do it, remove the pages from your site and submit them so that they are removed from the index. Once they are gone then re-submit the ones with your new title and description. It is hard to say which method is faster, since "deleted" pages can hang around for a while too.
I prefer the first method, i.e. to just wait, but I suppose it depends on how bothered you are by your current title and description.