Eating difficulties, drooling and tooth grinding are common. Poor muscle tonus of the orofacial musculature is also common, and tends to impact on the development of face and jaws. Thus occlusal (bite) anomalies are frequent, for example, post-normal occlusion (Class II malocclusion) and a large horizontal overjet. There is an increased risk of tooth cavities (caries) and gingivitis. Epileptic seizures may lead to an increased risk for dental trauma.