I was excited that just a mouthwash at a very reasonable price would whiten my teeth. I bought it and at first it made my mouth feel cleaner after brushing but after about 3 weeks of use my mouth felt so raw. My teeth look almost transparent? I'm no dentist but it seems this is much more abrasive than necessary. I discontinued use and now my teeth look worse than before. I truly think it stripped the enamel off my teeth and now everything I eat or drink darkens my teeth.