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The Whitening Collection 6pcs by LINHART is a remarkable whitening system that dentists in New York trust. This product comes with four syringes, but remember to use only a small amount for each application, as using the whole syringe can be excessive. One standout feature is the blue light, which truly delivers results. Brittney, the reviewer, attests that her teeth haven't been this white since she was 16, making her feel like she never even had a cup of coffee. Overall, this product seems to be highly effective in achieving a brighter smile. However, it is important to be cautious with the amount used to avoid any mishaps.