Green tea (GT), obtained from the extracts of a small plant, Camelia sinesis, is common worldwide. It is rich in flavonoids such as catechins and various other polyphenols, contributing to its antioxidant and anti-inflammatory properties. Green tea consumption is also associated with lower incidences of diabetes, cardiovascular disease, and obesity. Moreover, its antibacterial property aids in the reduction of bacterial colonization and thereby prevents oral diseases such as gingivitis, periodontal diseases, dental caries, and malodor .

When used as a mouthwash, green tea preparations can obliterate bad breath by suppressing anaerobic bacteria and eradicating the production of volatile sulfur compounds. There is a lack of critically appraised summaries on the efficacy of green tea mouthwash for promoting dental hygiene .

Chlorhexidine was developed in 1950 and is the most used anti-plaque agent. However, the long-term usage of chlorhexidine (CHX) is limited by altered taste perception and tooth staining with prolonged usage. Though CHX has been the gold standard mouthwash in controlling plaque formation, its undesirable side effects, such as the enhanced ability of calculus formation, bitter taste, and interference with taste, have inspired a search for alternatives

effictive against caries and periodontal diseases

Gingival Index (GI): (Loe and Sillness Index) records qualitative changes in the gingiva. It scores the marginal and interproximal tissues separately based on 0 to 3. The criteria are:

0= Normal gingiva.

1= Mild inflammation - a slight change in color and slight edema but no bleeding on probing. 2= Moderate inflammation - redness, edema, and glazing, bleeding on probing.

3= Severe inflammation - marked redness and edema, ulceration with the tendency to spontaneous bleeding.

The bleeding is assessed by gently probing along the wall of the soft tissue of the gingival sulcus. The scores of the four areas of the tooth can be summed and divided by four to give the GI for the tooth. The GI of the individual can be obtained by adding the values of each tooth and dividing by the number of teeth examined. The Gingival Index may be scored for all surfaces or selected teeth or for selected areas of all teeth.

Plaque Index (PI): (Sillness and Loe Index) is an index for estimating the status of oral hygiene by measuring dental plaque that occurs in the areas adjacent to the gingival margin (the gingival one-third of the teeth). It can be used on all teeth or selected teeth. It is used on all four surfaces (M, B, D, L). The criteria are:

0= No plaque.

1. A film of plaque adhering to the free gingival margin and adjacent area of the tooth, which can not be seen with the naked eye. But only by using disclosing solution or using a probe.
2. Moderate accumulation of deposits within the gingival pocket, on the gingival margin and/ or adjacent tooth surface, which can be seen with the naked eye.
3. Abundance of soft matter within the gingival pocket and/or on the tooth and gingival margin.

The participants will be asked to fill in at the end of the observation period a questionnaire to indicate on a 0 to 3 scale (0, disagree; 1 slightly disagree; 2, slightly agree; 3, agree) his/her level of agreement to nine statements concerning the mouthwashes under investigation regarding safety, tolerability, pleasantness, and performance.