After reading the reviews for this product, I thought to myself what a bargain. I generally spend so much on teeth whitening products that I was happy to find one so reasonable and would work (based on the reviews). If I hadn't waited so long to use the product I would have return it. The gel was consistent with clear water. When I put it in the trays the liquid ran out and what was left in the trays ran down the side of the trays into the back of my mouth. Maybe the product had expired, I didn't check. If you purchase the product make sure to check the expiration date and use right away. Good luck!