This product is a fossil of ancient mammalian teeth. It can be collected during the excavation of Fossil Bone. It appears as complete tooth shapes or irregular broken pieces, with complete specimens being classified into canines and molars. Canines are conical in shape, while molars are cylindrical or square-columnar, often featuring grooves and ridges of varying depths. Those with a bluish-gray color are referred to as "blue dragon's teeth," and those with a yellowish-white color are called "white dragon's teeth." The surface has a glossy enamel layer (enamel layer), is hard in texture, and the cross-section is rough and uneven. It is odorless and tasteless. Blue dragon's teeth are considered to be of higher quality. Its properties and functions are similar to those of Fossil Bone, but it has a stronger effect on calming the heart and mind, making it more suitable for conditions such as fright epilepsy, manic and depressive psychosis, and dysphoria with insomnia. It is typically decocted in a dosage of 10-15 grams, and should be decocted first.