People having the drinks - lemon juice squeezed into a glass of water - are being advised to drink through straws or flush afterwards with plain water to lessen the exposure of teeth to acidic lemon juice. Lemon juice has a pH of around 2. Pure water has a neutral pH of 7 while battery acid a pH of 1. Naturopath Erin O'Hara said the use of lemon water, especially in cleansing routines, has "been around a long, long time".
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