Abstract: A dissolvable tip 20 or 40 for a colon hydrotherapy speculum system 100 that replaces the function of an obturator. The dissolvable tip 20 or 40 is made of a body of dissolvable material wherein a surface of the tip 20 or 40 is inserted and snugly fit into an inserting end 17 of a speculum 10 while another surface of the tip 20 or 40 with the speculum 10 is inserted into the anal, rectal, or colon canal 91 of a patient 90. The dissolvable tip 20 or 40 is held at the inserting end 17 of the speculum 10. One embodiment of the present invention discloses the dissolvable tip 20 as a pill shaped and egg shaped tip. Another embodiment of the present invention discloses the dissolvable tip 40 as similar in shape to dissolvable tip 20, but the dissolvable tip 40 further has a circumferential bulge 44 in its body wherein the circumferential bulge 44 has an edge that contacts the perimeter of the inserting end 17 of speculum 10 to allow a further snug attachment between the dissolvable tip 40 and the speculum 10.