Mohammed SherifSharrawy,* Amro A. Abdul Razek,** AbeerAbd El-Aziz El-Gindy*** *Colleague of master degree, Faculty of dentistry, Mansoura University. **Professor of Endodontics, Faculty of Dentistry, Mansoura University. *** Associate Professor of Endodontics, Faculty of Dentistry, Zagazig University   Objectives: This study was designed to evaluate the ability of Malic acid with different concentrations (7% and 10%) as irrigants solution to remove smear layer using scanning electron microscope (SEM). Materials and methods: Forty eight extracted human permanent, single-rooted teeth were instrumented using Race rotary system to prepare and shape the canals, ending with file no #40, between each file, the canals were irrigated with 2 mL 5.25% NaOCl. Teeth were randomly divided into three test groups and one control group for final rinseas follow: group A Malic acid 7%, group B: Malic acid 10%, group C: EDTA 17% and group D: distilled water (control group(. Passive ultrasonic irrigation (PUI) was conducted in all groups with irrisafe tip #20. The teeth were examined by scanning electron microscope to evaluated degree of smear layer elimination. Results: SEM evaluation showed that all three irrigants (17% EDTA, 7% Malic acid, 10% Malic acid) can eliminate the smear layer effectively from coronal and middle third with statistically no significant difference between them. In the apical third 7%, 10% Malic acid showed statistically significant smear layer removal better than 17% EDTA. Conclusion: 7%, 10% Malic acid had superior smear layer removal ability compared to 17% EDTA especially in the apical region of root canal systems.