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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.*