An exhaust tooth capable of efficiently transmitting torque when changing an impact surface, an escape wheel including said escape tooth, a paddle escapement including said wheel 'escapement, a timepiece movement including said escapement wheel and a mechanical timepiece as well as a method of torque transmission. On an escapement tooth (1) of an escapement wheel (2) of an escapement of a mechanical timepiece, a rest spout (30) which connects a rest plane (10) and a impulse plane (20) has a curved shape losing a first part of a convex curved surface (31). A second part of the convex curved surface (21) is curved on a part which is continuous with the first part of the convex curved surface (31) of the rest spout (30) in the plane of impulse (20). The second part of the convex curved surface (21) can extend over the entire impulse plane (20). A radius of curvature R2 of the second part of the convex curved surface (21) can be extended by a part which is separated from the rest spout (30) in the impulse plane (20). The part which is continuous with the part of the second part of the convex curved surface (21) in the impulse plane (20) can be plane.
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