Please assess the completion status of the following clinical trial:

Trial Title: Fluoride Retention in the Mouth of Older Adults

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: NONE
- Phase: PHASE1
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Provision of signed and dated informed consent form~* Stated willingness to comply with all study procedures and availability for the duration of the study~* Good general health as evidenced by medical history~* Good oral health as evidenced by a clinical oral exam~* Having at least 20 teeth in the mouth, being at least 4 (natural or crowned) teeth in all four quadrants of the mouth~* Having salivary flow rate ranging from normal to hyposalivation according to direct flow rate determination methods~* Agreement to adhere to the study protocol~Exclusion Criteria:~* Unable to understand and/or follow study instructions~* Active periodontitis~* Oral pain~* In need of urgent dental care

- Gender: ALL
- Minimum Age: 65 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- Fluoride mouthwash alone, then Calcium mouthwash before a fluoride mouthwash (Type: EXPERIMENTAL): Participants with normal to dry mouth will first test a Fluoride mouthwash containing 226 ppm of fluoride, and fluoride concentration in saliva and dental biofilm will be assessed overtime for up to 2 hours. After a washout period of at least 3 days, they will then test a Calcium mouthwash (150 milimolars of calcium) immediately before the Fluoride mouthwash, and fluoride concentration in saliva and dental biofilm will be assessed overtime for up to 2 hours.
- Calcium mouthwash before a fluoride mouthwash, then Fluoride mouthwash alone (Type: EXPERIMENTAL): Participants with normal to dry mouth will first test a Calcium mouthwash (150 milimolars of calcium) immediately before a Fluoride mouthwash containing 226 ppm of fluoride, and fluoride concentration in saliva and dental biofilm will be assessed overtime for up to 2 hours. After a washout period of at least 3 days, they will then test the Fluoride mouthwash alone, and fluoride concentration in saliva and dental biofilm will be assessed overtime for up to 2 hours.

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