Please assess the completion status of the following clinical trial:

Trial Title: Efficacy of a 6% Hydrogen Peroxide Tooth Bleaching Agent

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: TRIPLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Age over 18 years (both sexes)~* 6 present upper front teeth~* No caries~* No restorations (anterosuperior group)~* No previous whitening treatments~* Tooth color value of A3 or less (Vita Classical scale), which was determined with a spectrophotometer (Vita Easy Shade® Compact) on the middle third of the vestibular surface of the maxillary lateral incisors~Exclusion Criteria:~* Pregnant or nursing mothers~* In pharmacological treatment~* Bruxism and patients who reported prior tooth sensitivity~* Previous tooth whitening (either at home or professionally)~* Visible dental cracks, developmental defects or teeth stained by tetracycline or fluorosis in the anterosuperior group~* Treatment with fixed appliances~* Periodontal disease or cancer

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- 37.5% gel (Type: ACTIVE_COMPARATOR): 37.5% gel to bleach teeth
- 6% gel (Type: EXPERIMENTAL): 6% gel to bleach teeth

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