Is it common to only get two premolars extracted for braces and not four?

Yes: It is very common to have 2 instead of 4 removed. Almost always it is because of significant upper tooth/jaw protrusion (and so the upper first premolars are removed). It is a time tested and very normal plan of treatment for certain patients. Best of luck!

All cases differ: All cases are different. Depending upon your bite you may have only needed two instead or four. Some people with crowding need four and some need none.

Yes: Extraction of upper premolars is sometimes indicated in cases of moderate overjet with no to minimal lower crowding. Extraction space is used to move the upper teeth back and correct the overjet.

Yes: The extraction of upper premolars is a common treatment, even as far back as the early 1900s. It is typically used to reduce severe protrusion of the upper front teeth for an adult patient (when accompanying lower extractions are not needed). It is well-researched and when appropriately provided, it produces excellent results both functionally and esthetically.

Yes: Especially in adults upper protrusion. No orthodontist likes to have teeth taken out. We do so only when there is no viable alternative. Every case differs, but about 30% of orthodontic dilemmas are best treated with extraction of 1 or more teeth. See an orthodontic specialist for evaluation.

Can be: Depends on your situation. If you are concerned, contact your orthodontist and ask for further explaination.