Background: To evaluate risk factors of dry socket. Materials & methods: A total of 100 subjects were enrolled. Previous dental infections and used methods to relief pain were noticed. Complete history was taken. 10 subjects were diagnosed with dry socket. P value ≤0.05 was considered significant. Results: The risk factors such as smoking and taking OCP increased the chance of dry socket development, but these relations did not show any significant statistical difference (P=0.9 and 0.6 respectively). Conclusion: Poor oral hygiene is an important factor that increase the incidence of dry socket. Keywords: Dry socket, Hygiene, Extraction.