Ginsing, your math is as much in error as your misplaced trust in foreign dentistry.  Assuming an Indian dentist saw 18 patients in a day for root canal treatment (way too many patients to do a good job), 365 days a year (highly unlikely), it would take over 15 years to get that PhD (assuming 100,000 patients only).  And my parents complained about the time it took me to get MY degree!