SEMA whitening gel ensures patient safety, comfort on the basis of nanophotocatalyst for faster whitening results. Featured with excellent hydrophilicity, adhesive and permeability, the whitening gel can rapidly oxidize the teeth through the dentin tubes, restoring them to a beautiful white in 30 minutes .SEMA is very effective for teeth that have been stained by smoking or by consuming substances, also by certain medicines, such as tetracycline, or speckled by fluoride as well as hereditary yellow teeth, making you enjoy a white and shiny smile for more than 2 or 5 years. Our professional teeth bleaching system is between 5 to 14 levels of shade improvement on the VITA shade guide, with an average improvement of 8 shades. The main ingredient is hydrogen peroxide, which does no harm to the tooth structure. Just 30 minutes – for your brightest, healthiest looking smile.