I have to tell you, gum disease is a serious threat. Untreated gum disease is an ongoing inflammation, it will raise your blood sugar and stress your body. And there is a strong connection between gum disease and heart disease.
I have gum disease, I have had it for years, no doubt another one of those complications of diabetes. And I have had a number of deep cleanings (also called deep scaling or root planing). I have had gum surgery (do not even go there). And I have lost teeth, most recently I had to surrender due to deep pockets and bone loss and have a tooth yanked out and bridgework done. And this is not because of sloppy dental care. I brush and floss three times a day, I use a proxy brush and I use an oral irrigator on top of all all mouthwashes and antibiotics. I have had to see a periodontist constantly for the last four years.
So I hope you will take this seriously. Deep scaling can be effective. Once your pockets are down to 4-5 mm, normal dental cleaning cannot reach down to remove plaque and infection from your pockets. Deep scaling pulls back your gum flaps and uses tools to scape away buildup all the way down into the pocket. Normal cleaning will generally not reach much below your gum line leaving deep pockets untouched. And obviously your normal at home care cannot get at these infections. Deep scaling is pretty effective at removing these infections, you often get an antibiotic treatment at the same time. In many cases your pockets will heal back up and be reduced back to normal levels. So it can be quite successful.
But I have to be honest, it is expensive and painful. And there is good chance it may not "cure" your gum disease. But we have diabetes. The odds are stacked against us. But you are unlikely to just get better without treatment. I don't regret any of my deep scalings, they were important to have done. I wish they were cheaper and less painful, but sometimes life just s*cks.
ps. If I recall, my deep scaling was at least partially covered by dental insurance.
pps. After my last deep scaling, my fasting blood sugar dropped like 10-20 mg/dl (I wasn't on insulin then), so it seriously affects your blood sugar.