1 concentration gradient The difference in the concentration of a chemical across a membrane. 2  cytoplasm The living substance inside a cell (not including the nucleus). 3  diffusion The movement of particles (molecules or ions) from an area of higher concentration to an area of lower concentration.
Not all stains can be lightened by over-the-counter or professional bleaching, and your dentist will be able to give you guidance. If you have sensitive teeth, gum disease or teeth with worn enamel, your dentist may discourage tooth whitening.
What it is: An exclusive, efficient, easy-to-use teeth whitening system for a whiter, brighter smile with a custom case for travel and storage. What it is formulated to do: Experience the power of a whiter, brighter smile. The most recommended teeth whitening system by dentists, GLO puts cutting-edge whitening technology in your hands at home or on the go. It is clinically proven to whiten teeth by five shades in as little as five days with no sensitivity.