Periodontal diseases (gingivitis and periodontitis) and dental caries are the two most prevalent oral infections affecting mankind worldwide and plaque is the common etiological factor. Plaque control is the basis and goal for prevention of gingivitis, periodontitis and dental caries. However, complete plaque removal is difficult to achieve and prevention can be achieved by reducing the quantity of plaque below the threshold level for disease or changing the quality of plaque towards more protective composition.

For effective plaque control, several mechanical (tooth brushing and flossing) and chemical oral hygiene aids are available. Among the various chemical antimicrobial agents available, Chlorhexidine is considered as gold standard. Chlorhexidine can be used as mouth rinse or gel, but has side effects such as staining of teeth and tongue, altered taste sensation and increased calculus formation over prolonged usage.

Recently, the extracts or oils of various medicinal plants having antimicrobial and anti-inflammatory activity has been reported and used for prevention of various oral infections. Aloe vera, is one such plant which was shown to have antimicrobial, anti-inflammatory, antiulcer activity and astringent effect. Considering the beneficial effects along with ease of availability, cost and no known adverse effects, Aloe vera can be a suitable alternative.

Recently a mouthwash containing Chlorine dioxide (ClO2) has become available on the market. Oral rinses containing ClO2 are utilized in dental practices as a topical antiseptic. Previous studies have suggested that ClO2 is bactericidal to most of the periodontogenic microorganisms and shown promising results.

The presence of fixed appliances in oral cavity for prolonged periods create favourable conditions for the development of dental plaque by providing retentive surface which increases the bacterial load. Hence, gingival inflammation and demineralization of enamel occurs more frequently in orthodontic patients with poor oral hygiene. Hence, there is a need for products for regular maintenance of acceptable oral hygiene without any adverse effects.

 Null Hypothesis: there is no difference in anti plaque and anti gingivitis efficacy of Aloe vera, Chlorine dioxide and Chlorhexidine mouth rinses among patients undergoing orthodontic treatment.