Over time, the following can leave stains: External Causes Dark beverages like coffee, tea, and wine Foods with strong pigments, such as tomato-based sauces Smoking and chewing tobacco Internal Factors Internal stains develop deeper within the tooth and can result from a variety of factors, including certain medications, untreated tooth decay, trauma to the tooth, or even genetic predisposition
In the case of tobacco smoke the maximum amount of irritation is produced because, in addition to the mechanical irritation (particles of carbon), there is also a chemical (tarlike combustion products) and a thermal (current of heated air) irritation
This includes efforts to lower carbon emissions, reduce waste (especially from cigarette butts and packaging), and promote sustainable farming practices in their tobacco supply chains
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[DOI] [PubMed] [Google Scholar] Stanley T