Scissors, garlic, ginger, dog teeth, these are all recognized things to ward off evil spirits and yin since ancient times, because these are masculine things in Feng Shui, which can ward off evil spirits when people sleep. Dog teeth can deter some bad things from invading, and ginger itself has a calming effect, so these evil spirits can help you sleep peacefully.
Shi Gandang on Mount Tai, the white elephant, the golden toad and the dragon turtle, the traditional mascots of China, all have the functions of suppressing evil spirits and guarding. But only by choosing the orientation and position of their placement can they give full play to their functions and bring you luck and peach blossoms.