Can periodontitis or other type of dental infection infect the sinus and the eyes?

A necrotic tooth infection can pass into the maxillary sinus. It's a long way to get to your eye, but not impossible. You've asked this question in another post. Make an appointment with a dentist to rule out a dental infection, then see your PCP.

No, but periodontal disease has been implicated in stroke, coronary disease, premature deliveries, liver disease, etc. Pleas see your General Dentist or preferably a gum/bone specialist, a Periodontist.