I went to the dentist last week and had x rays and a thorough cleaning/check up.  My jaw has been sore ever since and I came down with a terrible cold/sinus infection.  Could these be related to having my mouth open for so long or to the bacteria that was released during the cleaning?
Hello and thanks for consulting Chat Doctor.I have read your query. Sometimes a dental infection from a decayed tooth can lead to sinus infection. Opening the mouth for long can not be the cause for this. But during cleaning sometimes bacteria can enter the sinus and cause sinusitis, but this is also not very common. You can get your teeth checked for any decay. For sinusitis antibiotic like amoxicillin plus clavulanic acid can be taken. Hope this and your query. Take disregards