Abstract: An apparatus, system, and method for readapting a dental appliance to better fit a model of a wearer's teeth using a vacuum forming table and a heating element is disclosed. The readaptation apparatus is provided with an elastic membrane for closely conforming the dental appliance to the contours of the model upon application of negative pressure to the model and with a drum head adapter for retaining the elastic membrane to the surface of the vacuum forming table in order to efficiently readapt the dental appliance. The disclosed system includes the described readaptation apparatus, as well as a specialized vacuum forming device. The vacuum forming device positions the dental appliance a specific distance from a heating element on the vacuum forming device for bringing the dental appliance to a proper state of plasticity and then smoothly relocates it to the surface of the vacuum forming table, where the dental appliance is vacuum formed using the readaptation apparatus.