Depends where you are - in Australia or New Zealand you have to have at least a couple of years of work experience as a general dentist before you apply.
However I haven't heard of anyone who's had rankings below the 80th percentile during dental school or not acing the FRACDS Primary Examination get an interview. One of the incoming residents with me has close to 15 years of general dentistry experience.
If you check out the previous orthodontic program entry stats on the dentists/residents forum there are plenty who have worked for 3-4 years who have matched into US match and non-match programs
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