From: Orthodontic treatment demand for fixed treatment and aligners among young adults in middle Europe and South America – a questionnaire study
Country
A. No
B. I don’t’ know
C. Yes
Chile
266 (39,7%)
184 (27,5%)
220 (32,8%)
Poland
306 (72,5%)
53 (12,6%)
63 (14,9%)
Total
572 (52,3%)
237 (21,7%)
283 (25,9%)
Difference CL/PL
< 0.001