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If your face is swelling badly it is likely you have an infection. It's not possible for me to tell you the exact source of the problem without doing a clinical evaluation. But if you have a full upper denture and have no upper teeth, there is a strong chance that the source of the issue is a lower tooth on the left side and likely infection. Stress in your life might contribute to teeth clenching and jaw pain, but generally not sever swelling. I would strongly recommend that you call your dentist for full evaluation and a likley prescription for the correct antibiotic medication. The dentist will take an xray which will likely reveal the source and specific nature of your issue. You'd be wise to do this as soon as you can to avoid the swelling (and possible infection)getting worse.
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