PROBLEM TO BE SOLVED: To provide a denture cleaning method capable of appropriately brushing a portion to which a denture plaque portion attached to a denture is attached or substantially removing stain to the periphery due to a dyeing agent in cleansing, and the dyeing agent for denture.SOLUTION: The denture cleaning method includes: rinsing the denture after a lapse of a prescribed time after applying a foam-like denture dyeing agent 5 containing water-soluble dyeing pigment, across a plate part 2 of a denture 1 taken out from the oral cavity and the whole surface of an artificial tooth part 3 detecting a colored part colored by reaction of the dyeing pigment contained in the denture dyeing agent 5 with the denture plaque and mechanically brushing the part with a denture brush or the like till the color disappears. The denture dyeing agent 5 has a liquid-like form formed by mixing a cleaning agent, a humectant, a stabilizer, a bactericide, a colorant, a flavoring agent, and purified water. Alternatively the denture dyeing agent 5 has a tablet-like form formed by mixing a foaming agent, a cleaning agent, a humectant, an auxiliary cleaning agent, a bactericide, a colorant, and a flavoring agent.
