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20 of 23 people found the following review helpful: By This product markets a 20% Carbamide-Peroxide bleaching gel. The 20% concentration is considered strong in comparison to the concentrations available. Most at-home systems use a 10-15% concentration of Carbamide Peroxide. The MAJOR drawback to this system is that it assumes that you have a custom-moulded bleaching tray, which is essential to using this product correctly and safely. IF YOU DO NOT HAVE A CUSTOM-MOULDED MOUTH TRAY, DO NOT USE THIS PRODUCT. A custom-moulded tray must fit the teeth precisely and must not allow the bleaching gel to leak from the tray. A properly moulded tray will have a reservior for the gel, and a contoured scalloped border that prevents the gel from coming into contact with the gum tissues. (Sustained contact of the bleaching gel with gum tissues will result in a...Read more 5 of 5 people found the following review helpful: By MsLitigious "MsLitigious" (Orange County, CA) - See all my reviews Amazon Verified Purchase(What's this?) This review is from: Opalescence PF 15% Teeth Whitening 4pk of Mint flavor syringes FRESHEST ! (Health and Beauty) Today, I received the Opalescence PF 15% from this seller. I cannot attest to it being a good or bad product because I will not be using it as it did not have an expiration date anywhere. An expiration date is required. I will not use an oral hygiene product that does not have an expiration date which is clearly required by law. Also, I am very disappointed that this seller did not include a receipt or any paperwork for the return of the product. I will NEVER buy from this seller again. 6 of 7 people found the following review helpful: This review is from: Opalescence PF 15% Teeth Whitening 4pk of Mint flavor syringes FRESHEST ! (Health and Beauty) The product they supplied was great and the shipping was super fast. I would definately buy from them again. |