Dentin Sensitivity 1 Double-Blind Method 1 Humans 1 Mouthwashes 1 Oxalic Acid 1 Potassium oxalate Sodium Fluoride 1 Treatment Outcome 1 Yeaple probe 1 cold air stimulus 1 dentin 1 dentin sensitivity 1 double blind procedure 1 human 1 mouthrinse 1 mouthwash 1 oxalic acid 1 sensitivity 1 sodium fluoride 1 treatment outcome 1 visual analog scale 1