This article provides a comprehensive and detailed description of the technique for making a custom tray for the delivery of bleaching gel in dentist-supervised home bleaching systems. Specific recommendations about certain steps and materials are made and the advantages offered by these variations are explained. This information should facilitate the preparation of the tray by the dental staff in office or provide some guidelines to the dental laboratory to improve its service. The resulting appliance may offer some advantages for patient comfort during specific treatment regimens.