Ban Karem, Ibrahim LM. Periodontal health status and salivary enzymes level in smokers and non-smokers (comparative, cross sectional study). J Bagh Coll Dent. 2013;25(3):91-96. Accessed May 3, 2024. https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/264