hello and welcome to HCM forum,
I would like to inform you that whenever tooth pain is associated with
sinus, antibiotics , anti inflammatory and anti allergic medication is the line of treatment.
In your case, i agree with your
dentist as he could not find any cavity in any of your tooth, therefore the pain is radiating from the sinus.
Kindly continue with the medication and see your doctor after completion of the course.
Till then you can do warm saline rinses(5-6 times/ day).
apply
cold compresses on the affected side.
Do not worry you will be fine soon.
You can take low dose painkiller to control pain.
i hope i answered your query.
i wish you good health.
take care.