This study was conducted to estimate the hypothesis that the topical hyaluronic acid mouthwash have no role in the treatment of recurrent aphthous stomatitis

Recurrent aphthous stomatitis (RAS) is a common and widely recognized disorder involving the oral mucosa. It occurs typically as a single or multiple well-defined painful self-limiting ulcerative lesions influencing the nonkeratinized oral mucous membrane surrounded by red halo. The prevalence of RAS is up to 25% in the world population, with recurrence rate of 50% every 3 mouths. The exact cause of RAS is uncertain, and accordingly numerous components are as yet being implicated such as genetic, hormonal, traumatic, nutritional, allergic, immunological, and psychological factors.

Inclusion Criteria:

The inclusion criteria were as follows:

• Age 18-30 years.
• Minimum of 2 years of RAS history, with active ulcer less than 48 hours of recurrent aphthous stomatitis.

Exclusion Criteria:

• known history of hypersensitivities to Chlorhexidine or hyaluronic acid.
• Use of any medication as a treatment for the present active ulcer.
• Smoking and presence of systemic diseases such as Behçet disease, anemia, Crohn's disease, ulcerative colitis, acquired immune deficiency syndrome, and liver or kidney disease.
• Pregnant or breast-feeding women.
• Stomach ulcer, duodenal ulcer, and inflammation of the stomach or the esophagus.
• Treatment with systemic nonsteroidal anti-inflammatory drugs, systemic steroids or other immune modulatory agents, oral antihistamines, or systemic antibiotics in the previous 3 months.

Because the research not published yet.

The clinical outcomes were assessed by an investigator masked about the treatment modality that has been used