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.
Hello, using the baking soda as a tooth whitener is not designed to bleach your teeth. Baking soda is basically an oxygenator that breaks down organic substances that can discolor the tooth's surface, just as it removes stains from laundry items.ello, using the baking soda as a tooth whitener is not designed to bleach your teeth. Baking soda is basically an oxygenator that breaks down organic substances that can discolor the tooth's surface, just as it removes stains from laundry items.