Dental floss, continuous dental floss, and method for manufacturing continuous dental floss

Dental floss comprising:

• a floss part that is formed by twisting a plurality of filaments together but not tying up the filaments;
• and
• a plurality of tied-up parts provided continuously with the floss part, and are formed by tying up the plurality of the filaments,
• wherein each of the plurality of tied-up parts are formed in such a manner that the plurality of filaments are covered with a contour part in a cross section of the plurality of filaments,
• wherein the floss part and the plurality of tied-up parts are constituted of a same continuous raw yarn,
• wherein the plurality of the filaments are twisted together inside each of the plurality of tied-up parts,
• wherein each contour part is continuous around an outer circumference of a cross section of each of the plurality of tied-up parts,
• wherein the plurality of filaments disposed inside the contour parts are more dense than the plurality of filaments in the floss part, and
• wherein the plurality of filaments are tied up by the contour part of each of the plurality of tied-up parts.