'Teeth' in the Bible

in the day when the keepers of the house (hands, arms) tremble, and the strong men (feet, knees) bow themselves, and the grinders (molar teeth) cease because they are few, and those (eyes) who look through the windows grow dim;

when the doors (lips) are shut in the streets and the sound of the grinding [of the teeth] is low, and one rises at the sound of a bird and the crowing of a rooster, and all the daughters of music (voice, ears) sing softly.