Based on the provided reference, Thailand has the most and worst dental problems.
According to the reference, only 10% of people in Thailand have no oral health problems, and a mere 5% are satisfied with the condition of their teeth. In comparison, the UK had a much higher percentage, 40%, of people reporting no dental issues.
Here's a simplified comparison:
| Country | Percentage with No Dental Problems |
|---|---|
| Thailand | 10% |
| UK | 40% |
Therefore, the reference indicates that Thailand faces the most significant challenges related to dental health.
