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Tooth whitening or tooth bleaching is the process of lightening the colour of human teeth. [1] Whitening is often desirable when teeth become yellowed over time for a number of reasons, and can be achieved by changing the intrinsic or extrinsic colour of the tooth enamel . [ 2 ]
A cavity starts in a tooth's outer enamel and spreads to the dentin and pulp inside. The goal of water fluoridation is to prevent tooth decay by adjusting the concentration of fluoride in public water supplies. [2] Tooth decay (dental caries) is one of the most prevalent chronic diseases worldwide. [29]
Cementum is slightly softer than dentin and consists of about 45% to 50% inorganic material (hydroxylapatite) by weight and 50% to 55% organic matter and water by weight. [16] The organic portion is composed primarily of collagen and proteoglycans . [ 17 ]
Sodium bisulfite (or sodium bisulphite, sodium hydrogen sulfite) is a chemical mixture with the approximate chemical formula NaHSO 3.Sodium bisulfite is not a real compound, [2] but a mixture of salts that dissolve in water to give solutions composed of sodium and bisulfite ions.
Smile Time 50,000 20 Teeth whitening oral cosmetics Touker Suleyman and Steven Bartlett Unclear [note 6] Active [358] [359] Episode 6 10 February 2022 Sofie Hepworth Little Hoppa by Sophie 75,000 (received £100,000) 45 Eco friendly baby-cot Touker Suleyman Signed Active [360] [361] Episode 6 10 February 2022 Shehzaad Shaikh and Zain Peir
The IPCC described this method as "whitening roofs, changes in land use management (e.g., no-till farming), change of albedo at a larger scale (covering glaciers or deserts with reflective sheeting and changes in ocean albedo)." [1] The most well-known type of reflective surface is a type of roof called the "cool roof". While cool roofs are ...