Composition, degradable plastic, toothbrush head and toothbrush

The invention provides a composition, a degradable plastic, a toothbrush head and a toothbrush, the composition is a degradable plastic composition, the degradable plastic composition comprises the following raw material components by mass percentage: 30-80% of polylactic acid, 10-20% of polylactic acid, 1-5% of a plasticizer, 1-5% of an antioxidant, 1-5% of a lubricant, 1-5% of a lubricant, 1-5% of a lubricant, and 1-5% of a lubricant. 10 to 40% of polyester; 10-30% of a filler; 0.2 to 0.4 percent of an antioxidant; 0.2%-0.6% of a lubricating agent; wherein the mass percent ratio C1 = polylactic acid/polyester is 1.0-8.0, and the polyester comprises aromatic aliphatic copolyester and/or aliphatic polyester. According to the composition provided by the invention, by controlling the ratio of the raw material components and the ratio of the mass percent of the polylactic acid to the mass percent of the polyester, the degradable plastic formed by the composition has good machinability and mechanical properties,