Orthodontic treatment caused me to have narrow throat, obstruction of nose, post nasal drip. it's a 4 teeth extraction orthodontic treatment. i regreted getting orthodontic treatment done?

Unfounded: It is the standard of care in orthodontic treatment to extract the upper and lower first bicuspids to allow more room for your other teeth to align properly . I suggest you seek out a ENT specialist for your other problems.

Ortho Rx: It is doubtful that your Orthodontic treatment caused the symptoms you are reporting. The literature does not support your accusations. It sounds as if you have a problem best addressed by a specialist ENT. However, also ask to be reexamined by your Orthodontist to assure that there are no lingering issues.