Periodontal treatment is the specialist cleaning of your teeth and gums to help control the bacteria that cause gum disease. Gum disease is caused by the germs (bacteria) which live in your mouth.
Ground-Level Ozone (O 3). Ground-level ozone is a colorless and highly irritating gas that forms just above the earth's surface.It is called a secondary pollutant because it is produced when two primary pollutants react in sunlight and stagnant air.round-Level Ozone (O 3). Ground-level ozone is a colorless and highly irritating gas that forms just above the earth's surface.
Ground-level ozone is formed from nitrogen oxides (NOx) and volatile organic compounds (VOCs) when they are exposed to sunlight. In the last hundred years, the concentration of ground-level ozone has doubled in Europe. The highest ozone concentrations are found in countries in central and southern Europe.