A dental impression kit includes a container including a dental assembly that includes a dental tray and a predetermined amount of base putty and catalyst putty, where the base putty and the catalyst putty are mixable to form a putty mixture, and the predetermined amount of base putty and catalyst putty are amounts sufficient such that the putty mixture can be positioned in the dental tray for creating a dental impression. The dental impression kit includes instructions instructing a user to administer the dental assembly to create the dental impression, where the dental impression provides information necessary to manufacture a plurality of dental aligners specific to the user and being configured to reposition one or more teeth of the user, and where the predetermined amounts of the base putty and the catalyst putty are in the range of 0.5 ounces and 1.5 ounces.