My pattern seems to be developing various dental issues during the more marked relapses in my ME, abscesses, impacted wisdom teeth, dying nerves, then as there is some remission a period of a year or more getting the dental issues sorted. Fortunately my current relapse only resulted in needing one root canal filling and repair to the tooth part of one implant, though the first lockdown delayed the getting them sorted.
Over the course of my ME I have had three implants, one of which also required a bone graft. Though they took it out of me, and I needed good long gaps in the various stages I had no problems with the procedures or the implants themselves.
Other than needing more time to recover from the various stages in the procedure in terms of energy levels and ME symptoms, the only problem I have had relating to a dental procedure was avoiding infection in the healing void following a wisdom tooth extraction.