The invention discloses a tooth-decay-preventive oral freshener which is prepared from Cortex magnoliae officinalis, Euphorbia thymifolia, Clinopodium megalanthum, cassia alata, Herba pogostemonis, green tea, cassia twig, Spina gleditsiae, Oregano leaf, edible tulip, Costus root, Drymaria cordata, Euphorbia antiquorum, Abroma angusta, common zinnia, Radix curcumae, xylooligosaccharide, propolis, cellulase, pectinase, luteolin and hyperin. The tooth-decay-preventive oral freshener is quick in action, is up to 93% in effective rate and is 84% in healing rate; raw materials are easy to get and low in cost, so that economic burden of a patient is reduced; hyperoside is extracted in a pure natural manner, thereby being safe, healthy and free of toxic and side effect, extraction rate is up to 11.3%, utilization rate of traditional Chinese medicine is increased, and production cost is saved; the tooth-decay-preventive oral freshener is faintly scent and slightly sweet in flavor and free of peculiar smell of the traditional Chinese medicine, so that the patient does not resist it; the tooth-decay-preventive oral freshener is simple to use, the patient only needs to spray twice after a meal, and the tooth-decay-preventive oral freshener can quickly resist bacteria, diminish inflammation, stop pain and inhibit deterioration of tooth decay.