The outcome is the same with or without the light. The light may provide some faster initial rate of change in the first few days, but it is the peroxide that is doing the bleaching. Most likely, they only give the appearance of whitening as a result of dehydration or drying out of the tooth.
The main problem with lights, besides additional expense, is that there can be an increase in tooth sensitivity. The first step is to determine why the tooth is dark, as that is often an indication of dental disease, which may require additional or different treatment.
Once the cause of the discoloration is determined, there are two techniques that can work well for an individual darkened tooth. If the tooth has become dark because it needs a root canal or has already had one, it can actually be bleached from the inside.
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