Separators are placed in order create a extra space between the teeth so as to ease the band placements. When the adequate space us created it pops out on its own.
Next Steps
Pulling out the separator might not be possoble pn ur part. Dnt try to pull it out as sometimes it cause lacerations of the gums. It wud be better to consult ur Surgeon b4 taking any steps.
Health Tips
Warm saline gargle may help to ease out ur pain