Dentin hypersensitivity is a frequently encountered problem in dentistry. Hypersensitivity may occur wherever the dentin is exposed by attrition or abrasion, or the root surface is exposed by periodontal disease, In this study, ninty n six patients were examined for dentin hypersensitivity prior to different periodontal treatment. Mechanical, thermal and chemical stimuli was used in order to established hypersensitivity. A subjective assesment of the degree of hypersensitivity for each stimulus was recorded. There was 100 % increase of the pain (hypersensitivity) scores after periodontal surgical treatment. Patients were divided into two groups. Sodium fluoride was applied by iontophoresis for desensitization after different periodontal treament to the first group. It was not applied anything for the hypersensitivity treament to the second group. Following surgical treatment after one week sensivity scores decreased 89.3 % in first group. Only one month later sensitivity scores decreased 23.4 % in second group. Consequently, this findings showed that sensitivity after periodontal treatment even if nothing is done. But iontophoresis may be prefered for decreasing of the sensitivity in the short time and effective.