Does upper wisdom teeth cause mouth breathing?

No. Wisdom teeth, upper or lower would not cause mouth breathing. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health!

No, Mouth breathing caused by partially blocked airway. See both Orthodontist and Oral Surgeon to evaluate shape of your oral cavity and throat.