Behavioral problems could be easily observed in patients with various mental disorders, and may be inevitable. Self-injurious behavior(SIB) can be defined as a deliberate or subconscious alteration or destruction of one's body without conscious suicidal intent. SIB frequently involves oral tissues and could vary from a trifling injury to damages that could lead to further disabilities. The cases presented in this report discuss oral SIB due to Tic disorder and ADHD and their treatments. Clinicians should be well aware of the possibility of oral SIB in various mental disorders as well as the diverse depths of such behaviors accordingly. Moreover, different treatment modalities should be prioritized according to the causative mental disorders.ope
