If you are suffering from pain in many teeth.. and it started during last 2 days. Than its acute periodontitis
case i.e pyorrhea. Its due to your poor oral hygiene
. Home remedy won't work. Professional cleaning of your teeth & gums is advised. Follow post scaling instructions and you will never suffer again.
But if the pain is only on one side of the mouth, than it can be one infected tooth, the pain of which is radiating to other neighboring teeth, as they share the same nerve
Don't confuse sensitivity with pain. Sensitivity in teeth means: sensitivity to cold
, hot & sweet. Pain is different thing. Its pain, if you suffer while chewing food, while lying down, or when you suffer continously from it.
As you have not provided enough data to understand your problem, we advice you to consult a dentist