| 主权项 |
1. A toothbrush comprising:
a head having a head width and extending along a longitudinal axis; a handle extending along the longitudinal axis, and having a base and a center portion positioned between the base and the head; a first set of bristle tufts arranged along a first row and having a first height, all bristle tufts of the first set of bristle tufts attached to the head and oriented in a vertical position, the first row being substantially perpendicular to the longitudinal axis and substantially spanning the head width; a second set of bristle tufts arranged along a second row and having a second height, all bristle tufts of the second set of bristle tufts attached to the head and oriented at a first angle leftward of the vertical position, the second row being substantially parallel to the first row, substantially perpendicular to the longitudinal axis, substantially spanning the head width, and adjacent to the first row; a third set of bristle tufts arranged along a third row and having a third height, all bristle tufts of the third set of bristle tufts attached to the head and oriented in the vertical position, the third row being substantially parallel to the second row, substantially perpendicular to the longitudinal axis, substantially spanning the head width, and adjacent to the second row; and a fourth set of bristle tufts arranged along a fourth row and having a fourth height, all bristle tufts of the fourth set of bristle tufts attached to the head and oriented at a second angle rightward of the vertical position, the fourth row being substantially parallel to the third row, substantially perpendicular to the longitudinal axis, substantially spanning the head width, and adjacent to the third row, wherein the third row is located between the second row and the fourth row. |
