Smell sensation at baseline; post-irrigation 1 week; 2 weeks; 3 weeks; 4 weeks and 6 weeks. VAS score -VAS will be graded by patients which zero is completely normal smell sensation and ten is total loss of smell. ;Smell perception of specific odors (fish sauce; orange; coffee and jasmine ) at baseline; post-irrigation 1 week; 2 weeks; 3 weeks; 4 weeks and 6 weeks. Total Visual analog scale (VAS score) of smell perception of specific odors including 4 well-recognized odors for the Thai population. Specific odors include fish sauce; orange; coffee and jasmine ;Time to correct identification more than75% of odors and number of odors identification at each follow-up among each group baseline; post-irrigation 1 week; 2 weeks; 3 weeks; 4weeks and 6 weeks. Identification of 4 well-recognized odors for the Thai population will be assessed to evaluate time to recovery and number of odors identification at each follow-up among each group

Smell sensation at baseline; post-irrigation 1 week; 2 weeks; 3 weeks; 4 weeks and 6 weeks. VAS score -VAS will be graded by patients which zero is completely normal smell sensation and ten is total loss of smell. ;Smell perception of specific odors (fish sauce; orange; coffee and jasmine ) at baseline; post-irrigation 1 week; 2 weeks; 3 weeks; 4 weeks and 6 weeks. Total Visual analog scale (VAS score) of smell perception of specific odors including 4 well-recognized odors for the Thai population. Specific odors include fish sauce; orange; coffee and jasmine ;Time to correct identification more than75% of odors and number of odors identification at each follow-up among each group baseline; post-irrigation 1 week; 2 weeks; 3 weeks; 4weeks and 6 weeks. Identification of 4 well-recognized odors for the Thai population will be assessed to evaluate time to recovery and number of odors identification at each follow-up among each group