I am quite sure it will kill Syphilis, since it kills Lyme bacteria, and they are similar.
I think the only way to kill it all is going to be a low dose of continuous MMS treatment for probably two years minimum.
Spirochete bacteria that are pleomorphic are especially difficult to eliminate completely. They usually can convert into a cyst form that is impervious to most any treatment. You have to kill it in one of its other forms, so you have to wait it out.
You may want to look into Rife type frequency treatments also.