Please assess the completion status of the following clinical trial:

Trial Title: The Effect of Experimental Dentifrices on Remineralization of Caries Lesions In-situ

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: None
- Number of Arms: 6.0

Eligibility Criteria:
Inclusion Criteria:~* Good general health with no clinically significant and relevant abnormalities of medical history or oral examination~* Participants with maxillary dental arch suitable for the retention of the palatal appliance~Exclusion Criteria:~* Participants taking fluoride supplement~* Pregnant or breast-feeding women

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: t

Study Arms:
- Sodium fluoride (1426 ppm) (Type: EXPERIMENTAL): Non-zinc, 1426ppm fluoride as sodium fluoride in a silica gel base
- Sodium fluoride (1150 ppm) (Type: EXPERIMENTAL): Non-zinc, 1150ppm fluoride as sodium fluoride in a silica gel base
- Sodium fluoride (250 ppm) (Type: EXPERIMENTAL): Non-zinc, 250ppm fluoride as sodium fluoride in a silica gel base
- Sodium fluoride (1426 ppm) + zinc base A (Type: EXPERIMENTAL): Zinc base A, 1426ppm fluoride as sodium fluoride in a silica gel base
- Sodium fluoride (1426 ppm) + zinc base B (Type: EXPERIMENTAL): Zinc base B, 1426ppm fluoride as sodium fluoride in a silica gel base
- Fluoride (0 ppm) (Type: PLACEBO_COMPARATOR): Non-zinc, 0ppm fluoride in a silica gel base

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