Our full-mouth professional laboratory-made bleaching trays are made with reservoirs. To maximize the bleaching process, reservoirs allow more bleaching gel to come in contact with the teeth. Without reservoirs, you are minimizing the effectiveness of the bleaching gel. Custom whitening trays are handmade by a dental lab technician using an exact impression of your teeth. You will receive free 3-Way pre-paid shipping with mailing materials in your package. After receiving good impressions, you will receive your trays within 5 business days of us receiving the impressions.