Subject participated in the ATLAST Study, and completed the 28-day take-home period

Subject understands the Study protocol and is willing and able to comply with Study requirements and sign the informed consent form.

The study physician and investigator believe that study participation is appropriate for the subject.

Subject has at least one molar in each of the four quadrants of the mouth (right upper, right lower, left upper, and left lower).

The ATLAST Long-Term Study