26 patients who will administrate topical corticosteroid: triamcinolone acetonide 1% oral gel "Kenacort-A Orabase" * three times daily for 8 weeks applied after meals and at night with avoidance of foods and drinks for 30 minutes after the application. In addition to one capsule of 400 mg oral systemic vitamin E supplement* will be prescribed once daily at the morning

whole treatment response and the size of the oral lesions will be recorded using Thongprasom et al. scoring system, score 5 was assigned to patients having white striae with erosive areas >1 cm2, score 4 for patients with white striae and erosive areas <1 cm2, score 3 for those having white striae and atrophic areas >1 cm2, score 2 for those having white striae and atrophic areas <1 cm2, score 1 for those having only white striae, and score 0 for normal mucosa

At baseline, 4th week and 8th week after the treatment, burning sensation using Visual Analogue Scale (VAS) will be measured on a 10-point (0 = no symptoms, 10 = severe pain)

Patients will be asked to rinse their mouth with 5 ml of normal saline for 3 min then tilt their head forward and expectorate saliva into a sterile beaker without swallowing. The saliva samples will be stored at -20 ºC till the time of analysis. It depends on the addition of Griess Reagents which convert nitrite into a deep purple azo compound; photometric measurement of the absorbance due to this azo chromophore accurately determines NO2-concentration