Bleaching is not harmful to your teeth, assuming no halogen lamps or laser are used!
Old techniques:
Bleaching gel, which used to be (and still is) applied to teeth, is dried using laser or halogen lamps. This supposedly „activates“ the gel. But this is not true!
The light dries out the tooth,which looks whiter for a very short period. The whitening effect only holds for about 1-2 days, once the tooth starts absorbing moisture, it turns darker.
Drying out a tooth can damage it and the tooth nerve.
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This is why bleaching should always be performed without lamps or lasers.
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Watch a video film on this topic here!
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