Please assess the completion status of the following clinical trial:

Trial Title: Effectiveness of Propolis Mouthwash on Gingivitis

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* Gingival index \>1~* Periodontal pocket depth ≤ 3 mm~* Clinical attachment loss 0~* Provision of written informed consent~* Good systemic health.~Exclusion Criteria:~* Severe periodontal disease, as characterized by purulent exudates, generalized mobility, and/or severe recession~* Any condition that requires antibiotic premedication for the administration of a dental prophylaxis.~* Self-reported pregnancy, intent to become pregnant during the study, or breast-feeding.~* Any diseases or condition that could be expected to interfere with the safe completion of the study.~* History of antibiotic use in the previous 3 months.~* Individuals with orthodontic appliances or prosthetic appliances that would interfere with evaluation.

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: 30 Years
- Healthy Volunteers: t

Study Arms:
- Placebo (Type: PLACEBO_COMPARATOR): Subjects were asked to rinse 10 ml of mouthwash twice daily for 21 days.
- Propolis (Type: EXPERIMENTAL): Subjects were asked to rinse 10 ml of mouthwash twice daily for 21 days.
- Chlorhexidine (Type: ACTIVE_COMPARATOR): Subjects were asked to rinse 10 ml of mouthwash twice daily for 21 days.

Based on this trial design, predict the completion outcome and termination type (if applicable).