If it's a traditional Zoom Whitening, it's very effective, but can be quite painful. The solution that is painted onto your teeth seeps into the gums and down to the roots and can cause, especially if you have sensitive teeth, blasts of nerve pain for hours after the treatment..so much so that they give you a de-sensitizing gel to put on afterward, but even taking 800 mg of motrin, I was getting some heavy-duty "zingers" they're called, and I'm not sure I'd do it again.
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