my son always love.to bite his finger . and worst part is the whole 10 fingers all he can bite. how can I stop him. any good advise

Agree with Diana. Cautionary tales are the best way to stop kids from doing anything they shouldn't. It's a bit extreme but these cautionary stories are based in truth, except really extreme and graphic. My grandma used to tell me and my brothers that putting my fingers in my mouth or suckling on them will deter our fingers from growing naturally.