Hello,
Sensitivity could be due to cavity of removal of upper surface of teeth.
Use anti- sensitivity tooth paste SHY-NM or Vantej tooth paste.
Take pea size toothpaste and massage it over the tooth where you have sensitivity. Leave it for 5 to 10 minutes then brush your all teeth using same tooth paste.
Next Steps
Avoid using tooth paste for a longer period of time.
If sensitivity does not get not relieved, visit your nearby dentist after 1month.