Hello dear
I think you have gained these false knowledges and informations from internet.
Facial artery , Maxillary artery these will be vert difficult for you to understand and how they supply to the teeth.
All there you are totally puzzled and confused.
Next Steps
In your age you will never develop clinical Blood pressure.
so you don't have to worry.
Health Tips
please don't panic.
One humble request to you dear that don't indulge your self with these uncompleted knowledge and information.It will just make you crazy nothing else.
so trash all these thinkings and concentrate in your daily life.
If you really want to keep your teeth intact maintain proper oral care and hygiene.
Have a nice day.