Oral health issues might be direct effects of the virus, immune response, or secondary complications resulting from the infection. Common dental-related post-COVID symptoms include: Dry Mouth (Xerostomia); Altered Taste (Dysgeusia):Mouth Ulcers or Sores; Oral Thrush (Candidiasis); Jaw Pain and TMJ Disorders; With PBM ( photobiomodulation ) laser energy, most of those symptoms can get great improvements.