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A customized dental tray comprising ULDPE is formed using a person's own teeth as a template, or using a stone model of the person's teeth. A preformed dental tray or sheet comprising ULDPE is heated to become plastically deformable and placed over at least a portion of the person's teeth in order t

A customized dental tray comprising ULDPE is formed using a person's own teeth as a template, or using a stone model of the person's teeth. A preformed dental tray or sheet comprising ULDPE is heated to become plastically deformable and placed over at least a portion of the person's teeth in order to form an impression of the person's teeth and yield an intermediate customized dental tray. Upon cooling sufficiently, the intermediate tray is removed from the persons' mouth and trimmed as needed to yield a finished customized tray corresponding to the person's teeth. The performed tray or sheet preferably comprises ULDPE, which yields a highly flexible and resilient final tray, although they may also contain other polymers or blends. The customized dental tray is useful for teeth bleaching and other dental treatments known in the art.

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1. A method of manufacturing a customized dental tray corresponding to a person's teeth comprising:providing a preformed tray comprising a bottom wall having a substantially U-shaped configuration, a front side wall extending laterally from an outer edge of the bottom wall, a rear side wall extendin

1. A method of manufacturing a customized dental tray corresponding to a person's teeth comprising:providing a preformed tray comprising a bottom wall having a substantially U-shaped configuration, a front side wall extending laterally from an outer edge of the bottom wall, a rear side wall extending laterally from an inner edge of the bottom wall, and a hollow interior defined by the bottom wall, front side wall, and rear side wall that is sized and configured to approximate a corresponding shape of a person's dental arch, the front and rear side walls of the preformed tray having a thickness in a range of about 0.3 mm to about 1.8 mm; heating the preformed tray to a temperature at which said preformed tray becomes plastically deformable, the preformed being able to sufficiently retain its shape without external support so as to be useful in forming a dental impression; applying a blockout material to at least a portion of the person's teeth; upon applying the blockout material, placing the preformed tray over said at least a portion of the person's teeth without any external mechanical support other than fingers; causing the preformed tray to at least partially conform to the person's teeth in order to form a customized dental tray, wherein the blockout material forms one or more reservoirs within the interior of the customized dental tray; allowing the customized dental tray to cool to a temperature at which it is no longer plastically deformable; removing the customized dental tray from the person's teeth; and trimming the customized dental tray so that the tray does not significantly overlap the person's gingival when in use. 2. A method as defined in claim 1, the preformed tray being heated by immersing it in water.3. A method as defined in claim 1, the preformed tray being heated by means of a heat gun or blow torch.4. A method as defined in claim 1, the preformed tray being heated to a temperature in a range of about 110° to about 180° F.5. A method as defined in claim 1, the preformed tray being heated to a temperature in a range of about 120° to about 170° F.6. A method as defined in claim 1, the preformed tray being heated to a temperature in a range of about 130° to about 160° F.7. A method as defined in claim 1, the preformed tray being caused to at least partially conform to the person's teeth by the person applying suction so as to remove at least one of air or water from between the person's teeth and the preformed tray.8. A method as defined in claim 1, the preformed tray being caused to at least partially conform to the person's teeth by pressing the preformed tray against the person's teeth by means of at least one of a finger or the person's tongue.9. A method as defined in claim 1, the blockout material comprising a curable resin.10. A method as defined in claim 1, the preformed tray comprising ultra low density polyethylene.11. A method as defined in claim 10, the preformed tray further comprising at least one of ethylene vinyl acetate, polycaprolactone, polypropylene or another form of polyethylene.12. A method as defined in claim 1, the preformed tray further including a handle, the method further comprising removing the handle from the preformed tray and smoothing the customized dental tray in an area where the handle of the preformed tray was detached.13. A method as defined in claim 1, the customized dental tray being trimmed so that an upper periphery of the customized dental tray terminates shy of the person's gingival margin when in use.14. A method as defined in claim 13, further comprising scalloping the upper periphery of the customized dental tray up and around the person's interdental papilla.15. A method as defined in claim 1, the preformed tray shrinking and more closely conforming to the person's teeth upon placing the tray over the person's teeth and allowing the tray to cool.16. A method as defined in claim 1, the blackout material comprising a wax.17. A method as defined in claim 1, the blockout material comprising at least one of a clay or putty.18. A method of manufacturing a customized dental tray corresponding to a person's teeth comprising:providing a preformed sheet comprising a thermoplastic material; heating the preformed sheet to a temperature at which said preformed sheet becomes plastically deformable but is able to sufficiently retain its integrity as a sheet so as to be useful in forming a dental impression; applying a blockout material in at least a portion of the person's teeth; upon applying the blockout material, placing the preformed sheet over said at least a portion of the person's teeth without external support other than fingers; causing the preformed sheet to at least partially conform to the person's teeth in order to form a customized tray, wherein the blockout material forms one or more reservoirs within the interior of the customized dental tray; allowing the customized tray to cool to a temperature at which it is no longer plastically deformable; removing the customized tray from the person's teeth; and trimming excess tray material from the customized tray. 19. A method as defined in claim 18, the preformed sheet comprising ultra low density polyethylene.20. A method as defined in claim 19, the preformed sheet further comprising at least one of ethylene vinyl acetate, polycaprolactone, polypropylene or another form of polyethylene.21. A method as defined in claim 18, the preformed sheet having a rectangular or square shape.22. A method as defined in claim 18, the preformed sheet having a horse-shoe shape.23. A method as defined in claim 18, the preformed sheet being heated by immersing it in water.24. A method as defined an claim 18, the preformed sheet being heated by means of a heat gun or blowtorch.25. A method as defined in claim 18, the preformed sheet being heated to a temperature in a range of about 110° to about 180° F.26. A method as defined in claim 18, the preformed sheet being heated to a temperature in a range of about 120° to about 170° F.27. A method as defined in claim 18, the preformed sheet being heated to a temperature in a range of about 130° to about 160° F.28. A method as defined in claim 18, the preformed sheet being caused to at least partially conform to a person's teeth by the person applying suction so as to remove at least one of air or water from between the person's teeth and the preformed sheet.29. A method as defined in claim 18, the preformed sheet being caused to at least partially conform to the person's teeth by pressing the preformed sheet against the person's teeth by means of at least one of a finger or the person's tongue.30. A method as defined in claim 18, the blockout material comprising a curable resin.31. A method as defined in claim 18, the customized dental tray being trimmed so that an upper periphery of the customized dental tray terminates shy of the person's gingival margin when in use.32. A method as defined in claim 31, further comprising scalloping the upper periphery of the customized dental tray up and around the person's interdental papilla.33. A method as defined in claim 18, the preformed sheet shrinking and more closely conforming to the person's teeth after the tray has been formed, upon placing the tray over the person's teeth and allowing the tray to cool.34. A method as defined in claim 18, the blockout material comprising a wax.35. A method as defined in claim 18, the blockout material comprising at least one of a clay or putty.