Nondevelopmental lesions of the hard tissues of the tooth, including carious, abrasion, erosion, attrition, and abfraction lesions, require varying amounts of time after tooth
[ncbi.nlm.nih.gov]
Acid erosion is another possible cause of translucency.
[colgate.com]
In contrast, enamel wear, such as dental abrasion and erosion, occurs after a tooth has erupted. What Causes Enamel Hypoplasia in Children?
[hurstpediatricdentistry.com]