Welcome and thanks for posting your query to Healthcare Magic.
As per your query you have a habit of biting nails and accidentally bit multiples of layers leaving hardly any nail. Now you like to know any possibility of nail growth.
After reading your query it appears that you have a impulse of eating your nail. So before you go for any nail growth possibilities yo should correct your nail biting habit strictly. This is the most important part in your nail growth. You can take help of a counselor or a psychiatrist
in treating this impulse.
Now for your nail growth if the root of the nail is not damage then the nails can grow back easily without any medications or any treatment.
Stop nail biting at once and go for best protein diet!!
Hope these informations will help. If you have further queries I will be happy to help.
"With good and healthy nail wishes"
Dr Sanjay Kumar Kanodia
MD (Dermatology & STDs)