Clindamycin is an antibiotic useful for the treatment of a number of bacterial infections.
(Wikipedia)
Chlorine Dioxide (CLO2) is effective against bacteria. MMS1, CDH and CDS are Sodium Chlorite Solutions (SCS) that contain CLO2. Direct application of SCS to your tooth is possible because you have easy access to the tooth. DMSO is a carrier and can carry whatever is mixed with it into tissue and even bone. The SCS with the highest CLO2 content when used externally would be CDS (100%), followed by CDH (50%) and last, MMS1 (10%).
If you have or can make CDS, it should be the best SCS to use along with DMSO mixed with it. The amount of a SCS mixed with distilled water (if you have it) would be 1 part SCS to 4 parts water. DMSO can be added to the SCS + water solution after you have rinsed your mouth with the SCS + water only solution to remove anything you don't want DMSO to carry into your mouth tissue and tooth.
Start with 1 drop of DMSO added to the SCS + water solution and increase by 1 drop each application. Hold this SCS + DMSO solution in your mouth as close to the problem tooth as possible for 1 minute or longer, then spit it out. You can do this protocol hourly.