Teeth whitening: yay or nay ?! are there side-effects?!

so I'm talking about professional whitening not at home kits. some dentists say whitening is OK, some don't recommend it. some that got it said they are happy with it, some that they regret it.

i know a bit about the process and I know there are multiple types of lamps: UV, LED, Plasma.

What interests me is if they all mean the same or if not, which one is better?!

have any experiences about teeth whitening or some info that could help me ?!

really want my teeth whiter... but I don't want to ruin my teeth.
Teeth whitening: yay or nay ?! are there side-effects?!
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