The main preservation methods for milk teeth are liquid immersion preservation and extraction of stem cells for reserve preservation after complete loss of milk teeth. After the loss of milk teeth can be preserved by local rinsing, hydrogen peroxide for soaking and then put into formalin solution for soaking can preserve the structure of the surface of the tooth, preventing the teeth from drying and weathering caused by tooth discoloration. Milk teeth want to carry out stem cell preservation, first of all, the teeth must be intact, no caries and dental tissue disease, and the root of the tooth is not obviously absorbed, after removing the teeth into a special protective liquid or take a low-temperature method to let the stem cells dormant, temporary preservation for the later extraction of stem cells. For home preservation, it is necessary to soak in the liquid for about 7 days to sterilize, and then put the milk teeth in a dry environment for preservation.