Thanks for asking the query,
Pain, sensitivity in the gums usually occurs during and after dental scaling and polishing.
Gap in the gums are due the removal of the plague
and calculus in between the teeth.
Apply some local antiseptic analgesic
cream topically over the affected area.
Take antiseptic mouthwash rinses twice daily.
Maintain a good oral hygiene
Take complete balanced diet and drink plenty of water to keep yourself hydrated.
Hope this helps out.