Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that swelling over the face can be due to anaesthesia injection, in case if the anaesthesia injection is injected deep and that too for the upper back teeth and if the needle is penetrated deep it can enter the mesh of veins known as Venous plexus and there can be
hematoma formation and it can lead to swelling..
Other cause can be due to
dental abscess if the swelling was present before injection also..
In case if it is due to hematoma formation it can take a few days to resolve and for this you do not need any medications and can do alternate warm and cool compresses.
In case if it is due to abscess,the filling needs to be removed, tooth needs to be cleaned again and pus needs to be drained followed by a course of antibiotics and painkillers..
You should consult your treating
dentist and get evaluated and a thorough clinical evaluation and
x ray can help in diagnosis and treatment can be planned accordingly..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.