A drill bit (10; 100) or boring tool comprising: - a shaft (16; 108) that extends along a longitudinal axis (30; 110) having a shank (18; 104) that is engageable with a tool at one end (18; 104) of the shaft (16; 108) and a cutting tip (20; 106) at an opposite end of the shaft (16; 108); wherein the cutting tip (20; 106) further comprises: - at least two cutting edges (12; 118) that each extend in an outward radial direction between the longitudinal axis (30; 110) of the shaft (16; 108) and an outer circumference of the shaft (16; 108), each cutting edge (12; 118) being tapered toward the shank (18; 104) as the cutting edge (12; 118) extends in an outward radial direction from the longitudinal axis (30; 110); and - each cutting edge (12; 118) including at least one deviation from a linear shape (56, 57; 152, 154), the at least one deviation having a curvilinear shape (58, 59; 156, 158) that extends between the linear shape (56, 57; 152, 154) of a respective cutting edge (12; 118) and an outer radial edge (70; 166) of the shaft (16; 108), characterized in that - each curvilinear shape (58, 59; 156, 158) of the respective cutting edge (12; 118) includes a number of valleys (76, 78, 80, 82; 170, 172) that extend in a downward longitudinal direction towards the one end (18; 104) of the shaft (16; 108) and a number of curved ridges (84, 86, 88; 174, 176, 178) that smoothly transition between the adjacent linear shape (56, 57; 152, 154), the respective valleys (76, 78, 80, 82; 170, 172) and the outer radial edge (70; 166) of the shaft (16; 108), and in that - the valleys (76, 78, 80, 82; 170, 172) and the curved ridges (84, 86, 88; 174, 176, 178) regress in a rearward rotational direction, a rotational direction opposite to the rotational direction (96, 186) of the drill bit (10; 100) or boring tool during boring operation, and the valleys (76, 78, 80, 82; 170, 172) and the curved ridges (84, 86, 88; 174, 176, 178) translate in a downward longitudinal direction toward the one end (18; 104) of the shaft (16; 108); and in that - a contour associated with the linear shape (56, 57; 152, 154), the valleys (76, 78, 80, 82; 170, 172) and the curved ridges (84, 86, 88; 174, 176, 178) regresses or declines toward the one end (18; 104) of the shaft (16; 108). - a shaft (16; 108) that extends along a longitudinal axis (30; 110) having a shank (18; 104) that is engageable with a tool at one end (18; 104) of the shaft (16; 108) and a cutting tip (20; 106) at an opposite end of the shaft (16; 108); - at least two cutting edges (12; 118) that each extend in an outward radial direction between the longitudinal axis (30; 110) of the shaft (16; 108) and an outer circumference of the shaft (16; 108), each cutting edge (12; 118) being tapered toward the shank (18; 104) as the cutting edge (12; 118) extends in an outward radial direction from the longitudinal axis (30; 110); and - each cutting edge (12; 118) including at least one deviation from a linear shape (56, 57; 152, 154), the at least one deviation having a curvilinear shape (58, 59; 156, 158) that extends between the linear shape (56, 57; 152, 154) of a respective cutting edge (12; 118) and an outer radial edge (70; 166) of the shaft (16; 108), characterized in that - each curvilinear shape (58, 59; 156, 158) of the respective cutting edge (12; 118) includes a number of valleys (76, 78, 80, 82; 170, 172) that extend in a downward longitudinal direction towards the one end (18; 104) of the shaft (16; 108) and a number of curved ridges (84, 86, 88; 174, 176, 178) that smoothly transition between the adjacent linear shape (56, 57; 152, 154), the respective valleys (76, 78, 80, 82; 170, 172) and the outer radial edge (70; 166) of the shaft (16; 108), and in that - the valleys (76, 78, 80, 82; 170, 172) and the curved ridges (84, 86, 88; 174, 176, 178) regress in a rearward rotational direction, a rotational direction opposite to the rotational direction (96, 186) of the drill bit (10; 100) or boring tool during boring operation, and the valleys (76, 78, 80, 82; 170, 172) and the curved ridges (84, 86, 88; 174, 176, 178) translate in a downward longitudinal direction toward the one end (18; 104) of the shaft (16; 108); and in that - a contour associated with the linear shape (56, 57; 152, 154), the valleys (76, 78, 80, 82; 170, 172) and the curved ridges (84, 86, 88; 174, 176, 178) regresses or declines toward the one end (18; 104) of the shaft (16; 108).