SPARKLE-DENT entered the market place in 1991, after U.S. Dental Corporation realized that there wasn't a denture cleaner on the market that was capable of removing tartar, plaque, calculus or even coffee or tea stains. SPARKLE-DENT was developed into a highly concentrated formula that would remove all of these stains without harming the soft reline material. SPARKLE-DENT will: remove tartar, calculus, plaque, coffee and tea stains from dentures remove tough stains without the use of harmful bleach. Economical to use due to its high concentration, Sparkle-Dent is easy to use! Soak appliances for 15 minutes. Use the solution for a full week of cleaning! Soaking time may be increased for excessively stained appliances.