Please assess the completion status of the following clinical trial:

Trial Title: A Study on the Effects of Two Nicotine Replacement Products on Tooth Staining

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

Eligibility Criteria:
Inclusion Criteria:~* Males and females aged 18 to 65 years~* Daily smoker, current daily smoking for at least 1 year~* Motivated to quit smoking, and willing to use NRT (nicotine gum or nicotine sublingual tablet)~* Normal chewing abilities (able to use chewing gum without any problems)~* Willing to refrain from dental prophylaxis for the duration of the 12-week trial~* Have a minimum of 20 natural teeth, with at least 10 of the 12 anterior teeth present and scorable.~* Have a total extrinsic facial tooth stain score equal or more than 28, according to the MacPherson Modification of the Lobene Stain Index.~* Willing and able to comply with scheduled visits, treatment plan, tests, and other trial procedures.~Exclusion Criteria:~* Use of other tobacco-containing products, such as cigars, pipe, smokeless tobacco products, etc.~* Existing use of any nicotine replacement products for smoking cessation, or undergoing any other treatment for tobacco dependence, such as hypnosis, acupuncture, bupropion, etc.~* Orthodontic appliances~* Gross periodontal disease, or signs of gross oral neglect~* History of oral cancer~* History of temporomandibular joint disorders known to aggravate jaw pain~* Unstable angina pectoris or myocardial infarction during the previous 3 months~* Pregnancy, lactation or intended pregnancy~* Any major metabolic disease, clinically important renal or hepatic disease Suspected alcohol or drug abuse~* Participation in another clinical trial within the previous three months and during study participation~* Any other severe acute or chronic medical or psychiatric condition that might increase the risk associated with trial participation or trial drug administration or may interfere with the interpretation of trial results and, in the judgment of the investigator, makes the subject inappropriate for entry into this trial.

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

Study Arms:
- Nicotine Gum (Type: EXPERIMENTAL): After being randomized to the gum or tablet, dosage will be based on baseline level of nicotine dependence. Highly dependent smokers will receive nicotine 4 mg gum, while low nicotine-dependent smokers will receive nicotine 2 mg gum to help them quit. Subjects will be advised to use the treatment frequently, according to the product labeling, in order to minimize or avoid symptoms of tobacco withdrawal. Study medication will be used for 12 weeks.
- Nicotine Microtab (Type: ACTIVE_COMPARATOR): After being randomized to the gum or tablet, subjects will receive instructions according to their baseline level of nicotine dependence. Highly dependent smokers will be instructed to use a 4 mg dosage of the Microtab (2 x 2 mg tablets), while low nicotine-dependent smokers will be instructed to use a 2 mg dosage of the Microtab to help them quit. Subjects will be advised to use the treatment frequently, according to the product labeling, in order to minimize or avoid symptoms of tobacco withdrawal. Study medication will be used for 12 weeks.

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

Answer: outcome: complete