Hi @awilst. I can’t find any information on a direct link between dental inflammation causing PMR. However, there is strong evidence that infections in the mouth from teeth or gums can impact the entire body because they are sources of bacteria and inflammation.
Here are two links that you might want to read which explain how bacteria from the mouth can influence other health issues:

There is also some evidence of amalgam fillings potentially causing an inflammatory response from the mercury used. Some people can be more sensitive to the exposure. I didn’t post them here but there are several articles found in searches online. But here is a link to a discussion in the forum with @freedomwarrior @siosal @athenalee and others regarding amalgam fillings and potential links to their autoimmune diseases.

As for periodontal scaling/root planing, these are highly beneficial dental cleaning techniques to keep your teeth and gums healthy along with your daily oral hygiene. Generally when you’re having your teeth cleaned by the hygienist, they will use instruments (scalers) to scrap plaque/tartar and stains from around the teeth near and just below the gum tissue. If buildup is heavy and eventually goes well below the gum line into pockets created by the debris, then a root planing is necessary to prevent further bone loss and infection. The same instruments are used in the procedure, but the technique takes longer to accomplish so more time is required than at a routine cleaning appointment. Occasionally this may also require some local numbing.

If you’re having dental checkups and prophylaxis cleaning on a regular basis with no major gum issues then there is no need for a root planing. When is the last time you had a dental check up?