24 packets of crystals. Specially Formulated to Clean: Mouth guards; Retainer; Clear braces. Kills 99.9% of odor-causing bacteria. Delivers a complete clean you can see, smell and feel in just 5 minutes. Kills 99.9% of odor causing bacteria. Removes build-up of mouth film. Reduces yellowing and stains. All without causing damage to retainers, mouthguards and clear removable braces. Use as directed. No persulfates. freshguardclean.com. Questions? 1-877-925-5374. Made in USA.