A dental tray for use in taking an impression of a person's teeth is provided. More particularly, the dental tray includes a first section having a longitudinal axis and a second section sized and shaped so as to be mounted at least partially within the first section. The first and second sections are sized and shaped so as to define a trough therebetween for receiving an impression-taking material. The second section is adapted to move relative to the first section in a first direction substantially parallel to the longitudinal axis of the first section. The second section has at least one member movable in a second direction substantially perpendicular to the first direction in response to the movement of the second section in the first direction.