Abstract: The present invention is dental tray for applying treatment gels to a person's teeth. The dental tray is sized and shaped to accommodate the dental arch of a person's oral cavity and is constructed from a temperature-dependent material such that the dental arch forms to the shape of the person's teeth profile at temperatures at or above that of the person's oral cavity. Once the dental tray is fitted to the person's specific teeth profile, a treatment gel is applied to the dental tray, the dental tray reinserted and the treatment gel applied to the person's teeth by contact therewith. In one embodiment of the present invention, the treatment gel is applied to the unformed dental tray such that the dental tray is fitted to the person's teeth profile simultaneous with the treatment thereof.