Dr Thumb held a clinical trial at Yonsei University, University Dental Hospital from 29 October to 25 November 2001. The results are detailed below. 

Test Subjects

• Sex ratio:
  Female: 60% (15 children)
  Male:  40% (10 children)

• Age ratio:
  12 months to 20 months old: 28% (7 children)
  21 months to 30months old: 40% (10 children)
  30 months or older: 32% (8 children)

1. What were the effects of using Dr Thumb for 2 weeks?

1) The thumb sucking habit has completely stopped: 24% (6 children)
2) Frequency of thumb-sucking has decreased: 68% (17 children)
3) No effect: 8% (2 children)
4) Frequency of thumb-sucking has increased: 0%

2. What were the effects of using Dr Thumb for 4 weeks?

1) The thumb sucking habit has completely stopped: 92% (23 children)
2) Frequency of thumb sucking has decreased: 8% (2 children)
3) No effect: 0%
4) Frequency of thumb-sucking has increased: 0%

3. Of those that found Dr Thumb to break the habit, how long did it take?

1) Within 1 week: 14% (3 children)
2) Within 2 weeks: 30% (7 children)
3) Within 3 weeks: 35% (8 children)
4) Within 4 weeks: 21% (5 children)

4. What were the children's reaction when wearing Dr Thumb?

1) Wears Dr Thumb without any reaction: 20% (5 children)
2) Complained at first but no reaction within 1-2 days: 44% (11 children)
3) Complained throughout the process: 16% (4 children)
4) Sucks the thumb that is not equipped with Dr Thumb: 20% (5 children)

Parents of 4 from the 5 children that began to suck their other thumb advised their children tend to suck their thumbs interchangeably, showing little preference for one thumb over another. After continuing the trial with Dr Thumb on both thumbs 4 of these 5 children had broken the habit and are included in the 92% success rate as above.

5. If you were to purchase Dr Thumb, which location would be the most convenient to buy it?

1) The high street: 36% (9 parents)
2) Retail parks: 36% (9 parents)
3) Online: 28% (7 parents)

6. As a parent with a child who sucked their thumb, what are your thoughts on Dr Thumb?

1) Fantastic: 72% (18 parents) 
2) Great: 20% (5 parents)
3) Good: 0%
4) OK: 4% (1 parent)
5) Needs improving: 4% (1 parent)
6) Poor. Does little to break the habit: 0%

Dr Thumb broke the thumb-sucking habit for 92% of our participants. Even for those that didn't have the habit broken within the 4 weeks, a dramatic improvement had been seen and these parents were confident the habit would be broken if they continue to wear Dr Thumb. No one reported any adverse effects; either in terms of the habit worsening, or any physical discomfort, markings or restrictions in use of their child's thumb.