After you have used a teeth whitening program, do not use a mouth wash with alcohol in it. The alcohol can actually diminish the effects of the program and revert your results or dramatically lower them. On the other side, an oxyegenating mouth wash may actually benefit the teeth whitening regimen.
Be sure that you rinse your mouth with water after you drink or eat something. If you rinse thoroughly, you will get all the remaining food and drink out of your mouth preventing them from staining your teeth. This will stop your teeth getting badly stained.