A-Over time, even with good teeth cleaning, plaque and tartar can attach to the teeth similar to lime build-up in a kettle or iron. The saliva fluids in our mouths contain calcium and bacteria.-According to oral hygiene standards, it is recommended that patients visit the dentist every six months for an oral health check-up, to discuss any medical changes such as new medications that can affect oral wellbeing, and to have teeth cleaned with scaling and polishing where necessary.
Industrial smog occurs when the smoke and sulfur dioxide produced from burning coal merges with fog and creates a yellowish-brown-colored haze close to ground level. Photoch â¦ emical smog forms as the result of increased usage of all fossil fuels, including gasoline and the burning of trees and organic waste.
The term smog was coined in the early 20th Century by combining the words smoke and fog. Smog is a form of air pollution which highly reduces visibility on land. Smog is primarily produced as a result of industry and automobile generated air pollution and is a common occurrence in many industrial and urban areas of the world today. Smog adversely affects life in these areas, creating visibility constraints, respiratory troubles and other ill effects on the health of people, plants and animals inhabiting the area.