THANKS FOR ASKING QUERY,
You are having sensitivity in canine tooth
which can be due to many reasons like-
due to toothbrush truama,heavey and regular consumption acidic drinks
Deep caries .
I suggest you to visit the dentist
and get it checked clinically and radiographically.
Plan the treatment accordingly, prevent food retention in that area, use soft bristle tooth brush , do not brush harshly , use antiseptic mouth wash , use sensodent k tooth paste.
hope this will help you.