Unique treatment trays that are easier to use and more comfortable for the patient. Deeply formed well trays are correctly contoured providing total coverage and contact all critical areas. Exclusive, patented contoured shape forms a lock between tray and palate creating a distal dam which prevents fluoride from flowing out of tray so patient will not gag. Fill lines provide a guide for pouring exact amount of gel without waste. Locking handle for easy placement and removal. Disposable. Color coded for easy identification.