The short version: it rarely stays put, and that is the whole reason dentists want to see one fast.
It is easy to read a dental abscess as a rough toothache with a bit of swelling attached. The catch is that an abscess is a live infection, not just pain, and infections have a habit of moving once they have somewhere to go. Knowing how that works makes it a lot clearer why waiting is the risky choice.
An abscess is a pocket of pus that forms when bacteria collect, either at the tip of the root or in the gum next to the tooth. Your body tries to wall it off, and that is often why the pain eases for a day or two.
That lull fools a lot of people. The infection has not gone anywhere. The pressure usually dropped because it found a new place to drain, which is the opposite of healing.
Left alone, the bacteria can work into the tissue around the tooth. The first stop is normally the soft tissue of the face and jaw, where the visible swelling comes from. In some cases it pushes toward the floor of the mouth and the neck, and that is where it can start affecting swallowing and even breathing.
Further spread is less common but possible. The veins in the face drain back toward the brain, so an untreated upper-tooth abscess can occasionally reach the sinuses or the area behind the eye. Bacteria that get into the bloodstream can travel too, which is how a tooth infection sometimes ties into problems far from the mouth.
A few things suggest the infection is on the move and needs attention right away:
If any of those show up, an emergency dentist in Canyon Country can drain the infection, start the right treatment, and handle the tooth before things escalate.
An abscess caught early is very treatable. Almost all of the danger comes from waiting, not from the infection being hard to stop. Seeing an emergency dentist at the first real sign is far simpler than chasing it once it has spread, and it is usually the line between a routine appointment and a serious one.