If you regularly enjoy coffee, tea, red wine and pastas with marinara sauce, you might be aware that these foods and beverages leave behind stains on your teeth well after they are consumed.
원문출처 : https://www.cnn.com/2019/10/03/health/salt-baking-soda-teeth-whitening-wellness/index.html
원문출처 : https://www.cnn.com/2019/10/03/health/salt-baking-soda-teeth-whitening-wellness/index.html