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An applicator includes an applicator member having an applicator portion. The applicator portion comprises a first succession of teeth and a second succession of teeth substantially opposite the first succession of teeth. At least a plurality of the teeth of the first succession have free ends situa

An applicator includes an applicator member having an applicator portion. The applicator portion comprises a first succession of teeth and a second succession of teeth substantially opposite the first succession of teeth. At least a plurality of the teeth of the first succession have free ends situated along a first line having a generally concave side facing away from the applicator portion, and at least a plurality of the teeth of the second succession have free ends situated along a second line having a generally convex side facing away from the applicator portion. The applicator portion defines an envelope surface, the envelope surface having, at least one point along its length, a cross-section being generally elongate in shape and having a major axis substantially parallel to a straight line joining together the first line and the second line.

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What is claimed is: 1. An applicator comprising: an applicator member comprising an applicator portion, the applicator portion comprising a first succession of teeth and a second succession of teeth substantially opposite the first succession of teeth, wherein at least a plurality of the teeth of

What is claimed is: 1. An applicator comprising: an applicator member comprising an applicator portion, the applicator portion comprising a first succession of teeth and a second succession of teeth substantially opposite the first succession of teeth, wherein at least a plurality of the teeth of the first succession have free ends situated along a first line having a generally concave side facing away from the applicator portion, wherein at least a plurality of the teeth of the second succession have free ends situated along a second line having a generally convex side facing away from the applicator portion, and wherein the applicator portion defines an envelope surface, the envelope surface having, at at least one point along its length, a cross-section being generally elongate in shape and having a major axis substantially parallel to a straight line joining together the first line and the second line, the straight line being substantially perpendicular to the first line and the second line. 2. The applicator according to claim 1, wherein a spacing, measured along the first line, between the free ends of two consecutive teeth of the first succession is less than or equal to a spacing, measured along the second line, between the free ends of two consecutive teeth of the second succession. 3. The applicator according to claim 1, wherein the first and second lines are spaced apart by a distance having a maximum value ranging from about 5 mm to about 9 mm. 4. The applicator according to claim 1, wherein the first and second lines are spaced apart by a distance having a maximum value ranging from about 6 mm to about 8 mm. 5. The applicator according to claim 1, wherein the envelope surface of the applicator portion has a cross-section that is substantially lenticular at the at least one point along its length. 6. The applicator according to claim 1, wherein the applicator portion has a longitudinal axis contained entirely in a single plane. 7. The applicator according to claim 1, wherein the applicator portion has a longitudinal axis not contained entirely in a single plane. 8. The applicator according to claim 1, wherein the applicator member is made of a non-elastomeric plastic material. 9. The applicator according to claim 1, wherein a size of each of the teeth of at least one of the first succession and the second succession, as measured along a tooth axis, is greater than or equal to about 0.5 mm. 10. The applicator according to claim 9, wherein a size of each of the teeth of both the first succession and the second succession, as measured along a tooth axis, is greater than or equal to about 0.5 mm. 11. The applicator according to claim 1, wherein a size of each of the teeth of at least one of the first succession and the second succession, as measured along a tooth axis, is greater than or equal to about 1 mm. 12. The applicator according to claim 11, wherein a size of each of the teeth of both the first succession and the second succession, as measured along a tooth axis, is greater than or equal to about 1 mm. 13. The applicator according to claim 1, wherein a size of each of the teeth of at least one of the first succession and the second succession, as measured along a tooth axis, is greater than or equal to about 2 mm. 14. The applicator according to claim 13, wherein a size of each of the teeth of both the first succession and the second succession, as measured along a tooth axis, is greater than or equal to about 2 mm. 15. The applicator according to claim 1, wherein the applicator member is made of a plastic material having a hardness greater than or equal to about 60 on the Shore A scale. 16. The applicator according to claim 1, wherein the teeth of the first and second successions have axes that extend along radii projecting from a common center. 17. The applicator according to claim 1, wherein at least one tooth of the first succession and at least one associated tooth of the second succession have axes that are substantially parallel. 18. The applicator according to claim 1, wherein at least a plurality of teeth of at least one of the first succession and the second succession have bases disposed in a staggered configuration. 19. The applicator according to claim 18, wherein at least a plurality of teeth of both of the first succession and the second succession have bases disposed in a staggered configuration. 20. The applicator according to claim 1, wherein, when the applicator portion is observed from a side, at least some of the teeth form grooves that are V-shaped. 21. The applicator according to claim 1, wherein the length of the first succession ranges from about 15 mm to about 30 mm. 22. The applicator according to claim 1, wherein the length of the second succession ranges from about 15 mm to about 30 mm. 23. The applicator according to claim 1, wherein the height of the teeth of the first succession ranges from about 2 mm to about 4 mm. 24. The applicator according to claim 1, wherein the height of the teeth of the second succession ranges from about 2 mm to about 4 mm. 25. The applicator according to claim 1, wherein the number of teeth of the first succession ranges from about 20 to about 40. 26. The applicator according to claim 1, wherein the number of teeth of the second succession ranges from about 20 to about 40. 27. The applicator according to claim 1, wherein the applicator portion has a longitudinal axis having at least two curved portions and each of the at least two curved portions curve in differing directions. 28. The applicator according to claim 1, wherein the applicator portion includes a core having a substantially rectangular cross-section and each of the teeth of the first and second succession are formed on the core. 29. An applicator system comprising: the applicator according to claim 1; and a receptacle configured to contain a substance to be applied by the applicator. 30. The system according to claim 29, further comprising a cosmetic product contained in the receptacle. 31. The system according to claim 29, wherein the cosmetic product is mascara. 32. The system according to claim 29, further comprising an elastically deformable wiper associated with the receptacle. 33. The system according to claim 32, wherein the wiper has an opening configured to allow the applicator member to pass therethrough while being withdrawn from the receptacle, the wiper being configured so that while the applicator member is passing through the wiper the opening changes shape by being lengthened in a direction substantially parallel to the major axis by an elongation factor that is greater than or equal to about 1.5. 34. The system according to claim 33, wherein, in the absence of the applicator member, the opening is substantially circular in shape. 35. The system according to claim 34, wherein the applicator comprises a rod having a substantially circular section, and wherein the applicator member is at an end of the rod and a diameter of the rod is greater than the diameter of the opening in the absence of the applicator. 36. The system according to claim 34, wherein, in the absence of the applicator, the opening has a diameter less than or equal to about 3 mm. 37. The system according to claim 33, wherein, in the absence of the applicator member, the diameter of the opening is less than or equal to a smallest cross-section of the envelope surface of the applicator portion. 38. The system according to claim 33, wherein the wiper has a wiper lip having a free end defining the opening. 39. The system according to claim 32, wherein the wiper has an opening configured to allow the applicator member to pass therethrough while being withdrawn from the receptacle, the wiper being configured so that while the applicator member is passing through the wiper the opening changes shape by being lengthened in a direction substantially parallel to the major axis by an elongation factor that is greater than or equal to about 2. 40. The system according to claim 32, wherein the wiper has an opening configured to allow the applicator member to pass therethrough while being withdrawn from the receptacle, the wiper being configured so that while the applicator member is passing through the wiper the opening changes shape by being lengthened in a direction substantially parallel to the major axis by an elongation factor that is greater than or equal to about 2.5. 41. The system according to claim 32, wherein the wiper is made of elastomer. 42. The system according to claim 41, wherein the wiper has a wiper lip having a free end defining an opening. 43. The system according to claim 32, wherein the applicator member has a proximal portion and a distal portion, the applicator portion being situated between the proximal portion and the distal portion, and the proximal and the distal portions being configured to make it easier to pass the applicator member through the wiper. 44. The system according to claim 29, wherein the applicator comprises a rod and an assembly portion to fix the applicator member to the rod. 45. The system according to claim 44, wherein the applicator member extends along a longitudinal axis of curvature such that a distal portion of the applicator member and a proximal portion of the applicator member are intersected by a straight line substantially parallel to a longitudinal axis of the assembly portion. 46. The system according to claim 29, wherein a size of each of the teeth of the first succession and the second succession, as measured along a tooth axis, decreases as the teeth of the first succession and the second succession near a distal portion of the applicator member. 47. A method of applying a cosmetic product, the method comprising: providing the applicator according to claim 1; loading a cosmetic product onto the applicator member; and applying the cosmetic product to at least one external body portion using at least one of a plurality of teeth of the first succession and a plurality of teeth of the second succession. 48. The method according to claim 47, wherein the external body portion comprises at least one of eyebrows and eyelashes. 49. The method according to claim 47, wherein the applying comprises applying the cosmetic product to at least eyelashes using at least a plurality of teeth of the first succession, and applying the cosmetic product to at least eyebrows using at least a plurality of teeth of the second succession. 50. The method according to claim 47, further comprising wiping excess cosmetic product from the applicator member. 51. The method according to claim 47, wherein the cosmetic product comprises makeup. 52. A method of applying a cosmetic product, the method comprising: loading a cosmetic product onto an applicator member comprising an applicator portion, the applicator portion comprising a first succession of teeth and a second succession of teeth substantially opposite the first succession of teeth, wherein at least a plurality of the teeth of the first succession have free ends situated along a first line having a generally concave side facing away from the applicator portion, and wherein at least a plurality of the teeth of the second succession have free ends situated along a second line having a generally convex side facing away from the applicator portion; applying the cosmetic product to at least eyelashes using at least a plurality of teeth of the first succession; and applying the cosmetic product to at least eyebrows using at least a plurality of teeth of the second succession. 53. The method according to claim 52, wherein the cosmetic product comprises makeup.