A periodontal disease preventive and ameliorative agent with milk-derived basic protein as its effective ingredient, which protein is obtained by contacting a milk or milk-derived ingredient with cation-exchange resin, and then eluting a fraction adsorbed by the resin using an elution solution and which protein has an isoelectric point within a range of 7.5.about.11, and food/drink and a medicament such as toothpaste and gargling agents, which contain this periodontal disease preventive and ameliorative agent.

Uma doença peridental preventiva e agente ameliorative com proteína básica leite-derivada como seu ingrediente eficaz, que a proteína é obtida contatando um leite ou ingrediente leite-derivado com resina de cation-exchange, e então eluting uma fração adsorbed pela resina usando uma solução do elution e que a proteína tem um ponto isoelectric dentro de uma escala de 7.5.about.11, e food/drink e um medicament tal como o toothpaste e os agentes gargling, que contêm este agente preventivo e ameliorative peridental da doença.

 
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