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.
It helps to remove any surface stains on your teeth. The final step is flossing. Your dental professional will use floss to make sure the areas between your teeth are clean. What you should do between visits Be sure to take care of your teeth and gums between regular dental visits.Plaque is always forming on your teeth, but you can get rid of it by brushing and flossing regularly. Here are some tips for good oral care at home. 1  Brush your teeth at least twice a day.2  Be sure to use a toothpaste that contains fluoride.t helps to remove any surface stains on your teeth. The final step is flossing. Your dental professional will use floss to make sure the areas between your teeth are clean. What you should do between visits Be sure to take care of your teeth and gums between regular dental visits.