What you seem to describe is an impacted, partially erupted wisdom tooth ("halfway under the gum & halfway out, kind of slanted") ... (like the graphics on this page illustrate)

... That also has a large carious lesion (cavity) ... ("The tooth has been coming out in pieces so there was just a shell").

We won't wager a guess at precisely what you see or what is going on but it seems likely that an infection in the area of the tooth is involved. If so, the basis for it might be either pericoronits (due to the poor positioning of the tooth) or an endodontic problem (the nerve has been affected by the advancing decay).

If either is the problem, at this stage, for this type of situation, a common scenario would be one where the patient's dentist places them oral antibiotics (so to lower the level of the infection) and then about a week later extract the tooth. If needed, pain relievers are used to control the patient's discomfort in the mean time.

If you are a current patient of record with a dentist (have an active chart at their office), possibly after a verbal evaluation over the phone they might feel it's appropriate as emergency treatment for them to prescribe these items for you by phoning the prescription into a pharmacy prior to actually seeing you in their office.

In lieu of that, and following with the same hypothesis about your tooth as above, being seen at an urgent care/walk in facility would probably lead to the same prescriptions. Of course, treatment by your dentist would still be needed.

Short of that, if what you are experiencing is pericoronitis, possibly gently rinsing the area with water might dislodge debris, carry away bacteria and help to establish drainage so the infection will subside more quickly. But in reality, the benefit of that would probably be marginal.

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