Document Classification

Section Type: METHODS

Text: Each was assigned to one of eight groups (six per group, 10 in positive control) ; positive control (citric acid, pH 2. 7, F (-) 0 ppm), negative control (pH 7. 0, F (-) 0 ppm) Listerine (pH 3. 87, F (-) 0. 021 ppm), Tesco Value (pH 6. 05, F (-) 289. 00 ppm), Tesco Total Care (pH 6. 20, F (-) 313. 84 ppm), Sainsbury 's (pH 6. 15, F (-) 365. 75 ppm), Sensodyne (pH 6. 12, F (-) 285. 30 ppm) and Corsodyl (pH 5. 65, F (-) 0 ppm).