Enamel formation is called amelogenesis and occurs in the crown stage of tooth development.
From the en.wikipedia.org
The twins, who live in Vista, were born with an uncommon genetic defect called amelogenesis imperfecta, which prevents the development of tooth enamel.
From the signonsandiego.com
Amelogenesis imperfecta is a hereditary disorder that manifests itself in tooth enamel that is abnormal in structure, low in mineral content and hence subject to rapid wear and chipping.
From the sciencedaily.com
Amelogenesis imperfecta, which occurs between 1 in 718 and 1 in 14,000 individuals, is a disease in which the enamel does not fully form or forms in insufficient amounts and can fall off a tooth.
From the en.wikipedia.org
More examples
The developmental process of forming tooth enamel
Amelogenesis is the formation of enamel on teeth and occurs during the crown stage of tooth development after dentinogenesis, which is the formation of dentine. ...