This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Gingival clefts may be caused by 
Select and explain. 
A. Occlusal disharmonies, B. Faulty toothbrushing, C. Normal frenum attachment, D. Use of dental floss
B: Faulty toothbrushing
Answer: B: Faulty toothbrushing 
Explanation: None