My dentist (also not Dr. Sarah) has stated over and over how so few of the dental clinics in Doha practice sterilization of their instruments, have trained hygenists, up-to-date equipment etc..   That would scare me to death.   I would rather pay extra for these important points than risk my families health.  Be careful and ask more questions than just cost.  BTW  my daughter's braces--start to finish---cost 15,000 QR  for 1 year, twice the cost of her sisters  (2years -more difficult case) which were done in the states.