In reply to Timmd:
Absolutely yes. Any abscess, like any deep set infection, can make you feel exhausted, and may also give you swinging fevers, nausea, general malaise, not to mention pain. Because of the gradual onset of much caries, we seem to somehow get mildly desensitised to the pain. But abscesses are usually very painful indeed.
Ignoring pain in the mouth is a bad idea. As Dave Garnett rightly says, ignoring infections, and dental infections can have serious consequences, if losing your teeth wasn't bad enough, but the classic is secondary valvular heart disease, which can kill quickly, and there is always a risk of sepsis (active bacterial infection/proliferating bacteria in the blood). Its those secondary problems that make me nervous everytime GPs are told to use less antibiotics.
As for probiotics, I don't know what the evidence is. I do know that antibiotics do alter bowel flora. I also know that faecal transplants work in C Difficile infection, and appear to have positive effects in a number of other conditions. I doubt it would do much harm, but I suspect some if the E coli strains may be more value than consuming lots of lactobacilli.
On a personal note, I had a recurrent pericoronitis around a partially emerged wisdom tooth which was a bit sore but made feel shit including tired. On one occasion I got prescribed metronidazole which sorted the infection fast unlike the multiple times I'd tried to ignore it or brush harder etc. However while taking it I had a catastrophic and rapid drop in mood and onset of depression and OCD like symptoms. I stopped the metronidazole before finishing the course but it didn't improve, which was the start of a long hard journey, which I'm still not at the end of 9yrs later. For the record, life at that time otherwise couldn't have been better. I've always suspected given the lack of reversal that the cause of rapid mood change might have had to do with alteration in bowel flora. I did try probiotics yogurt but this was before E coli supplements etc appeared. There's no particular evidence here, but something odd happened to me.