Typically in-office whitening systems are exceedingly safe for gum tissue because a modified resin barrier is placed over the gums. In some instances though, some of the whitening gel can "seep" under the barrier. This causes the gums to turn white (or oxidize). In some causes, this will cause the gums to peel or blister in that area of exposure. Depends on the severity of the oxidation, duration, etc.
But to answer your question, it rarely happens and in-office whitening is safe and DOES NOT Cause damage to gums.


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