Background & Objectives: Vast usage of Amalgam and it's poisoning nature related to mercury necessited the hygiene aspects of mercury to be put in to consideration. The aim of this study was to assess knowledge, attitude and practice of dentists towards the principles of mercury hygiene.

  Methods : In this descriptive analytic study, 116 dentists in their private clinic were selected randomly and were analyzed for the above parameters by questionnaire. Data were analyzed in spss.14/win software with descriptive statistic methods, t test and Pearson correlation test.

  Results : The mean of knowledge, attitude and practice of dentists were 45.74±13.28, 68.96±10.62 and 17.43±17.55 respectively. There was no statistically significant correlation between the knowledge and attitude and practice of principles of mercury hygiene. Besides there was no significant correlation between sex, specialty and graduation time with those parameters.

  Conclusion: Despite positive attitude and knowledge, practice of Tabriz dentists is not favorable. According to the positive attitude and the willingness of the dentists for knowledge enhancement and optimizing the practice for mercury hygiene, appropriate programming for mercury hygiene instruction during the educational period and continuing educational program can be very advantageous.