Brand from Japan: Kao. No scrubbing required, the foam cleans automatically!Removes slime, odor, and stains in just 5 minutes, eliminating 99.9% of bacteria!Utilizes Kao's exclusive BPT (Biofilm Peeling Technology) cleaning technology; the tightly adhering foam gently removes stubborn stains.Also suitable for various occasions such as orthodontic treatment, whitening, sleep, and sports.Fragrance-free.Approximately 45 uses.How to use:01. Place the mouthguard in the mouthguard holder or cup, press the pump to release foam, ensuring the mouthguard is completely covered.Suggested amount: Enough foam to completely cover the mouthguard (approximately 3-4 presses).02. Let stand for approximately 5 minutes, then rinse with water.Stubborn stains can be removed with a brush.This product is a refill only.