I received this product cloudy and full of air bubbles. I tried the gel several times anyway to give a chance and absolutely no results. I was told the gel should be clear and no air bubbles other wise no good. I bought 4 syringes of this anticipating whiter teeth but what a waste of my money. BEWARE...it says made in USA which is another reason why I purchased this but is more like china stuff. I have tried others and this is the worse.