Sir, in your symptoms sensitivity of cold since last one week. Causes of cold sensitivity: 1.root exposed due to plaque deposit and  sometimes tooth mobility: Treatment: scaling and root planning if required then sensitivity paste and if bleeding gums then medications atleast for 7 days 2. Caries: Treatment: filling only no medications required 3. Traumatic or fractured crown: Treatment: restored with filling or Capping sometimes rct indicated. Sensodine or any sensitivity paste will be for symptomatic relief but not for cure.

Hello If the tooth is sensitive you must check for decay and wear off of the tooth Please visit the dentist for a check up and x ray soon In these cases sensodyne might not help