Opalescence GO 15 PF Teeth Whitening Prefilled Trays (10 Treatments) Hydrogen Peroxide 15 and Potassium Fluoride – Made by Ultradent – GO15-PF-4638

Customers report that the whitening trays produce noticeable results within two days, with teeth becoming much whiter and stain-free. The product is easy to use, and customers find it effective, with one noting it works particularly well on coffee and tea stains. While some customers consider it a great value, others say it's not worth the money. Moreover, customers report dental irritation, with teeth and gums hurting during use, and issues with adhesiveness as the product doesn't stick properly to teeth.