Ask yourself, which is preferable, a corrupt database that you know is corrupt or a corrupt database that you don't know is corrupt.
CheckDB when run without a repair option (which is how you should run it) reads and checks for corruption, that's it.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability