The present invention relates to an oral composition which may prevent or treat sensitive teeth. The oral composition contains potassium phosphates, wherein potassium ions inactivate dental nerves to relieve temporary pains, and phosphates not only prevent the exposure of dentinal tubules, which is the basic cause of sensitive teeth, but also block the exposed dentinal tubules. The oral composition further comprises ursodesoxycholic acid, thereby improving the effect of relieving the pain caused by sensitive teeth.