A reusable toothpaste, comprising a toothpaste canister (1), a plunger (2), an upper plunger rod (3), and a lower plunger rod (4); the upper canister end (5) of the toothpaste canister (1) being provided with an upper seal (6), the lower canister end (7) being provided with a lower seal (8), the upper side of the toothpaste canister (1) being provided with an upper toothpaste port (9), and the lower side of the toothpaste canister (1) being provided with a lower toothpaste port (10); the plunger (2) being located inside the toothpaste canister (1), the upper plunger rod (3) being connected to the upper end face (27) of the plunger (2), the lower plunger rod (4) being connected to the lower end face (28) of the plunger (2), the upper plunger rod (3) being movably fittably connected to the upper seal (6), the lower plunger rod (4) being movably fittably connected to the lower seal (8), and toothpaste (11) being disposed inside the toothpaste canister (1); an upper toothpaste cap (16) being provided on the upper toothpaste port (9), and a lower toothpaste cap (17) being provided on the lower toothpaste port (10); when all of the reusable toothpaste has been used, new toothpaste can be injected into the toothpaste canister (1) and the toothpaste outer packaging can be reused, thus reducing consumption of toothpaste tubes, which is advantageous to energy conservation, emissions reduction, and environmental protection.