13 colonies tobacco Tobacco & Colonial American Economy For the nearly 500,000 Black

This decrease in oxygen supply is worsened by the other effects of smoking, notably that it constricts the blood vessels

There are millions of middle school and high-school students vaping that would not otherwise think of smoking, she says

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Dr Patel warns against: Tea and coffee Tannins in these drinks stick to enamel and cause yellowing. Red wine The deep colour and acidity can stain teeth over time. Smoking Nicotine and tar turn teeth yellow and brown. Sugary and acidic foods These weaken enamel, making teeth more prone to staining. Poor oral hygiene If plaque builds up, stains can set in more easily. Ageing Enamel naturally wears down over time, making the yellowish dentin underneath more visible. What can you eat and drink after teeth whitening

It was used for medicinal purposes, believed to possess healing properties that could treat various ailments