I have custom fitted trays made by the dentist. They were pricey--$600--but they fit your teeth perfectly. After the intial bleaching period, most patients do maintenance just a few times a year (after your six-month cleaning) or when you feel you need it.
The drawback? My teeth are sensitive to the bleaching gel, so my initial bleaching period took a little longer than normal. (The dentist said to bleach every three or four days instead of every night.) Not everyone has this sensitivity though.
Also, just an FYI--my dentist recommends the bleaching trays but not the in-office bleaching (where you sit under a light). He thinks that in-office stuff is too hard on your enamel.
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