I am trying to create an unusual ring in Blender 2.77. After using the subdivision surface modifier on my ring, I noticed the change affected the formation of the vertices, which appear to look like slight dents on the shank (inside of ring). I have lost my earlier files due to a fault in my portable hard drive therefore I cannot carry on working from a previous file. I can start from scratch, but I thought it is better to ask of any possible ways to fix my current file. Modifiers have been added before I noticed the mistake. I am sorry if this does not make much sense, I am still new to Blender and could not figure out this issue. Whatever I researched did not come up with relevant answers.
I have found a file which contains an older version of my ring. As you can see the shank edge has many tris. I have tried to make these quads, but that only repeats the problem. I am guessing this is the reason the shank edge has slight dents in the design. What is the best way to clean up this mesh?