Recurrent aphthous stomatitis (RAS) is a chronic inflammatory disease of man characterized by painful ulceration recurring with varying frequency. The pathophysiology of aphthous ulcers remains partly understood. The primary disorder appears to be the result of activation of the cell-mediated immune system. Aphthous ulcers may have abnormalities in cell communication and epithelial integrity. The diagnosis of aphthous ulcers is primarily clinical. Aphthous ulcers occur on areas of nonkeratinized mucosa of the mouth particularly the buccal mucosa, the labial mucosa, the floor of the mouth, the ventral surface of the tongue, and the soft palate. The treatment of recurrent aphthous stomatitis (RAS) still remains unclear and is based mainly on experimental data. The purpose of therapy include the management of pain and functional injury by suppressing inflammatory responses, in addition to reducing the frequency of recurrences or keeping away from the onset of new ulcers .Zinc has been identified as an important factor in repair of tissue.After considerable searching zinc was recognized as the beneficial impurity and a effective factor in healing .The goal of this study is to present the efficiency of dietary zinc supplements in the rate of Recurrent aphthous stomatitis healing.