By Karyn Polewaczyk, Dec 03, 2009

With Botox, from what I know, the effects are instantaneous. Depending upon the amount and location of the injection, it can last from three months to a year. This is a bad analogy, but think of your hair when it's freshly colored versus 6 months post-foil. Everything looks shiny and bright when you first leave the salon, but can look brassy and worn when you're in need of a touchup. I've never had Botox or other injectables, and personally don't think I would ever have them (though, I say never say never to almost anything in life), so take my perception with a grain of salt. Also, keep in mind that it's best to avoid new routines, such as waxing, Botox or a dramatic hair style, if you're prepping for a big event and haven't had it done before and aren't feeling too sure.

With a spray tan, give yourself at least two to three days. Even the best spray tans can give off noxious chemical after smells, and some can rub off on clothes. Plus, if the color is too dark, you'll have enough time to let it fade.