Dental A child resorts to lip biting habit without primary involvement of mentalis muscle, the differential diagnosis is: A Learned habit B Lack of parental care C Class II div I malocclusion D Patient is suffering from xerostomia resulting in cracked lips 💡 Explanation A child resorts to lip biting habit without primary involvement of mentalis muscle, the differential diagnosis is: ✓ Correct Answer: C. Class II div I malocclusion