Overview - Spark 3.5.5 Documentation - Spark

sparkThe Science Behind Spark. Spark Alners are made with TruGEN™, the latest innovation in clear alner material. Spark’s nearly invisible alners are clearer, more comfortable, and stain less than the leading alner brand.*The Science Behind Spark. Spark Alners are made with TruGEN™, the latest innovation in clear alner material. Spark’s nearly invisible alners are clearer, more comfortable, and stain less than the leading alner brand.*