Tooth rot can display early signs of bad breath, gum swelling, an unpleasant taste in the mouth, tooth sensitivity to cold or heat, and sensitivity to sour or sweet foods. Tooth rot can also mean toothaches or pain in the teeth, and discoloration of the teeth. Tooth rot can lead to tooth loss and other dental problems. Individuals who notice these early signs and symptoms should seek treatment immediately. Proper dental hygiene like brushing, flossing, and avoiding potentially harmful activities can help avoid tooth rot, as can keeping regular dental appointments. appointments every six months to monitor overall oral health and receive deep cleaning.