Dental health and mental health are strongly associated. Neglecting either of them can negatively influence on the other and induce many health and communication problems. Association between oral/dental health, self-esteem, quality of life and holistic health has been recognized for a long time. There has been increasing interest in dental health among patients with major mental disorders as well as in mental states and problems among patients with orodental disorders. Despite of huge progress in the field of dentistry psychiatric patients have had poor oral/dental health. Patients with major mental disorders have quite number of the risk factors for oral disease and consequently poorer dental health, but oral/dental problems and diseases are commonly overlooked or neglected. Bad or inappropriate dental care is related to the patients' amotivation, ignorance, fears, low economic status, stigmas and negative attitudes by the medical professionals. It is important to stress that dental diseases in psychiatric patients deserve the same attention as other comorbid somatic diseases. In this review we accentuate the need for more collaboration in order to bridge the professional gap between dentistry and psychiatry.