Hello and Welcome to HCM,
Thanks for writing to us.
Factors conducing to teeth sensitivity are
aggressive brushing, poor oral hygiene
, tooth decay
, crack in the tooth, temporomandibular joint disorder, gum recession, teeth grinding or periodontal disease, can result in sensitive teeth. Certain toothpaste brands, teeth whitening products, etc. can also lead to sensitive teeth.
Depending on the severity of the condition, use a soft bristle toothbrush. A soft bristle toothbrush will reduce the friction caused on the teeth.
If tooth decay is the cause, then respective treatment will be carried out to deal with the infected tooth.
Hope this helps you.
Wishing you good health...