Which condition is not associated with a change in tooth characteristics?

Achondroplasia is primarily a genetic disorder affecting bone growth, leading to disproportionate short stature and characteristic skeletal features. While it can have implications for the dental appearance, such as changes in the craniofacial structure, it is not directly associated with changes in tooth characteristics like enamel quality, shape, or development. Unlike cystic fibrosis, cleidocranial dysplasia, and hypophosphatasia, each of which has clear associations with dental anomalies or alterations in tooth characteristics (such as issues with enamel formation or the number and shape of teeth), achondroplasia does not typically affect the teeth themselves in a significant manner. This distinction clarifies why achondroplasia is the condition that stands out as not being associated with changes in tooth characteristics.