Any tooth agenesis in which the cause of the disease is a mutation in the LRP6 gene. The disease is tooth agenesis, selective, 7 (Monarch Disease Ontology id MONDO_0014749). Also known as: LRP6 tooth agenesis, STHAG7, tooth agenesis caused by mutation in LRP6, tooth agenesis, selective, 7; STHAG7, tooth agenesis, selective, type 7.