I think your teeth outer surface  rough due to enamel hypoplasia(defect in enamel formation). Or by any dental procedures... Because of this rough tooth enamel food particle stuck on tooth portion.. Subgingival plaque and supra gingival plaque become calcified to form a hard deposit(calculas) around tooth Subgingival deposit may cause gingival inflamation. Gingiva become swollen. Bleeding while brushing.... This will lead to mobility of tooth.

Get scaling done without delay. Use mouthwash. Stolin R toothpaste. Warm salt water gargle 3 times every day. Considering no high blood pressure. C.becosule forte is effective in this case.

No home remedies will help you here. You need to visit a dental clinic and get a cleaning done - either routine or deep. A thorough and comprehensive oral examination is also needed to diagnose issues other than gum related , if any.

Visit a nearby dentist and get a full mouth cleaning done. If there is any cavity that is gathering food then that shall have to be attended to as well. You may take vit c in the meanwhile.

The condition you are suffering from is commonly known as Pyorrhea is due to poor oral hygeine. Decayed tooth can also be a cuse of bad breath and food lodgment.