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The other way is with the light, and this is done in the surgery. The biggest brand name for this is Zoom, and this treatment often takes 1-2 hours. Each dentist will have a system that seems to work best for them, my personal preference is the home kit, and I provide two different concentration gels to minimise sensitivity and maximise results. Quite often desensitising before whitening is needed to make the whole procedure as comfortable as possible.
Teeth whitening doesn't last forever, so the maintenance is discussed prior to treatment, and as a dentist is prescribing the treatment, he or she can spot potential problem areas before you start treatment.