The American Academy of Pediatric Dentistry (AAPD) states that oral habits have a significant impact on the physical health of infants, children and adolescents. They recommend that dentists take different approaches for different children when correcting bad oral habits. Poor oral habits generally include excessive pacifier use, lip sucking and biting, nail biting, nighttime teeth grinding, mouth breathing, tongue spitting, and self-injurious behaviors. Sucking behaviors (such as finger sucking and pacifier use) are normal in infancy and are usually done to satisfy the infant’s desire to be exposed to the outside world. However, maintaining a sucking habit for a long period of time may cause some health problems for your child. Children over the age of 3 who still have excessive sucking behavior should seek medical attention from their dentist for professional intervention to correct the habit. Teeth grinding disorder, which causes habitual grinding of teeth during sleep and even unconsciously during the day, is a functionally abnormal movement of the chewing system. Teeth grinding is caused by a variety of factors, which include general factors (e.g., emotional stress, heteromorphic sleep, traumatic brain injury, mental stress) and morphological factors (e.g., malocclusion). Complications of bruxism include tooth wear, headaches, temporomandibular joint disorders, and masticatory muscle pain. There is preliminary evidence that teeth grinding symptoms in adolescence are self-limiting and do not persist into adulthood. There are various ways to treat teeth grinding disorder such as, oral health education, use of protective dental pads, psychological cue therapy and medication. Children with tongue spitting or mouth breathing habits may have malocclusion such as open front teeth, maxillary protrusion, or worse, stuttering. Bad habits such as tongue-spitting and mouth-breathing can be corrected, and treatments include simple correction of bad habits, teaching the child to swallow correctly, myofunctional and orthodontic treatments, and in severe cases, surgical procedures may be required. Repeated self-injurious behavior over a long period of time can cause physical damage to the child. Self-injurious behavior is rare in children with normal intelligence and is more common in children with mental retardation, psychiatric disorders, developmental defects and certain syndromes. If such behaviors are present, they require medication, behavior modification and physical restraint, and orthodontic appliances such as bite guides and protective jaw pads may be used. Since severe brain damage and lip and tongue biting habits may be strongly associated with mental stress, measures should be taken to prevent self-injurious behavior in such children. Sometimes, it is even necessary to extract their teeth. Unhealthy habits that affect the alveolar bone in a high frequency, consistently and directly, can trigger its deformation, but this needs to be identified by a dentist. Deformed alveolar bone can cause malocclusion malformations such as open bite, anticuspension, and ectopic eruption of teeth. The dentist should inform the child and the parents about the negative consequences of bad oral habits, so that the parents will pay enough attention.