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 be economical to use due to its high concentration Sparkle-Dent is Economical! One bottle cleans for a full 5 months.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. Soaking time may be increased for excessively stained appliances. "We receive letters from people all across the U.S.A. who are thrilled with the results of SPARKLE-DENT!"