How can tooth sensitivity and bad breath be cured?

Hello,

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As stated by you this seems to be a case of gum disease commonly called pyorrhoea. There are different reasons of teeth sensitivity. Most commonly sensitivity of all teeth and bad smell from the mouth is caused by gum disease called gingivitis or periodontitis. Other cause for sensitivity can be a generalized teeth erosion resulting due to gastroesophageal reflux in which due to acidity, the outer layer of teeth is washed off by acid. This also causes a foul smell. Treatment plan would depend upon the cause. I recommend you to take a full mouth X-ray (OPG). Avoid having very hot or very cold food and drinks. Mention if you have a history of chronic acidity and gastritis. Send an image of the oral cavity (mouth) for better and specific treatment planning.

Take care.