As we are all different - despite thorough oral hygiene and not eating a great deal of sugar, I had years of swollen gums that bled intermittently, and a great deal of plaque. I could tell that the hygienist, although always polite, was convinced my oral hygiene was poor.
Then - T2 followed by keto, my gums are strong, not swollen, no more bleeding, no plaque problem. Hygienist didn't know about the link between high BG and gum issues. She is now very complimetary. I know from other posters that their dentists/hygienists know about the link, but mine, very good otherwise, didn't.