the chance is low and contagios rare but the virus is present in the saliva so you must get the vaccine to be 100% sure.
the most contagious are people in the immune tollerant state who have from millions to billions of hbv in the blood.
hbv is at least 100% times more contagious than hiv and the virus can live 7 days on objects and surfaces
although very rare and difficult to get it from a spit on a meal i would make vaccine anyway
for example i have problems with my gums and when i eat an apple i leave blood on it, same thing when i wash my teeth i lose a lot of blood, so you find blood in my saliva and virus too, i guess even a kiss from me can be contagious, fortunately in my country vaccine is mandatory at birth from the '80 so i cannot spread hbv anywhere
This site complies with the HONcode standard for trustworthy health information.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.