Disclosed herein is a breath freshener whose phase is changed depending on the condition of use. A breath freshener of W/O emulsion phase comprises a monoglyceride as a main base, a polymer, an effective component for breath freshening, and a solvent. A breath freshener of solution phase comprises a monoglyceride as a main base, a polyol, a polymer, an effective component for breath freshening, and a solvent. Since the breath fresheners are sufficiently flowable to spray when being sprayed into the oral cavity, they are easy to use. In addition, the breath fresheners are phase-changed into a cubic phase by moisture, e.g., saliva, after being sprayed into the oral cavity, resulting in an increase in the viscosity and adhesiveness of the breath fresheners. Therefore, the effective breath freshening ingredient is slowly released from the breath fresheners, and as a result, continuous breath freshening effects are achieved.