Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Poorly Engineered Product
Review: I have no idea how effective the gel is because I cannot even get the trays to stay in place around my teeth, especially the lower one. Did they actually test these trays on human subjects before going to market? This is the worst teeth whitener product I have ever used, including the generic versions.
