Anecdotally, same with me. After I got covid a few months back, despite being vaccinated 3 times, I then got the flu a month later which hit me harder than covid, and another month later I find myself saddled with a nasty infection right below the root of one of my molars, which baffled my dentist as the x-ray shows absolutely nothing there a year ago and I have very good dental hygiene.
His hypothesis is that covid weakened my immune system enough to allow other "bugs" that would normally be fought by my immune system, to thrive and take hold much faster than normal, including the random tooth infection.
Similar with some of my friends, afte they got covid, they were on a marathon of getting sick the whole winter season despite being young, vaccinated, fit and living healthy lifestyles.