Economical, single-use mouthpieces for use with any Isolite dryfield illuminator system. The patented soft, flexible, non-impinging Isolite mouthpiece is easy-to-insert and comfortable for the patient. Latex-free mouthpieces are constructed of Isoflex™ and are available in four sizes: Adult Small, Adult Medium, Adult Large, and Pediatric. Mouthpieces are easily dispensed from the convenient operatory 10-paks.