Should i be concerned about pre cancer of the lip since my dentist said don't bite however said try some cream and if it doesn't heal see oral surgeon but my problem is my habit of biting my lip and the white patch doesn't heal and i usually bite it const

May be precancereous: Biting of the lip is not considered one of the factors inducing malignancy. Most lesions represent a viral or carcinogenic induction. If the white patch is leukoplakia this may be precancerous but rare again from biting. Rather than a V resection of the lesion to allow surgical repair, one may try Efudex (fluorouracil) cream. Apply each evening x 10 and 10 days of A&D ointment. May need bx if no response.