The use of mouthrinses may be of relevance as a complement to daily dental hygiene procedures, especially for patients who do not comply with a proper mechanical removal of dental plaque. Essential oils and delmopinol mouthrinses are effective to reduce dental plaque accumulation and gingivitis. Also an effect on dental bacteria can be found. The study hypothesis states that there are no differences between the mouthrinses on the reduction of gingivitis and dental plaque accumulation as well on the bacterial counts of Streptococcus mutans, Lactobacillus, aerobic and anaerobic bacteria.

Inclusion Criteria:

• Patient at the dental hygiene clinic of Faculdade de Medicina Dentária
• Signature of consent form
• Have, at least, two quadrant with 6 teeth each
• Gingival Index at baseline less than 3
• Presence of dental plaque

Exclusion Criteria:

• Use of a mouthrinse
• Dental Hygiene appointment in the past 6 months
• Use of antibiotics in teh past 3 months
• Presence of extensive caries and fractures of teeth