Hypoplastic Teeth: What Enamel Hypoplasia Is, Its Causes and How It Is Treated

Enamel hypoplasia means the enamel did not form fully while the tooth was developing under the gum. The result is a surface that is thin or missing in places. It can show as white, cream, yellow or brown patches, small pits, horizontal grooves or a rough, uneven texture. It can affect a few teeth or all of them.

It is a problem of quantity, with too little enamel. That makes it different from erosion, where good enamel is worn away later by acid, covered in our guide on tooth enamel erosion. It is also different from fluorosis, a change in enamel caused by too much fluoride, covered in dental fluorosis.

Enamel forms while the tooth is developing under the gum, before birth for milk teeth and through the early years of life for permanent ones, and anything that disturbs it at that stage can leave a mark. Common causes include premature birth or low birth weight, high fevers and serious illness in infancy, poor nutrition including vitamin D or calcium shortage, and some genetic conditions that affect enamel from the start.

An infection or injury to a milk tooth can also damage the permanent tooth forming beneath it, so a single permanent tooth may be affected. Often the cause is never pinned down, and there is nothing a parent did wrong.

Thin or porous enamel gives less protection. These teeth are more prone to cavities, wear down faster and are often sensitive to cold, sweet and brushing. Careful cleaning, fluoride toothpaste and regular dental checks matter more, and the dentist may apply fluoride or a protective coating.

Treatment depends on severity. Mild cases may need only monitoring and fluoride. Pits and weak spots can be restored with tooth-coloured fillings (see types of dental fillings). Bonding or veneers can improve appearance, and badly affected teeth sometimes need crowns. In children, treatment is often kept simple until the permanent teeth are fully in.

Whitening does not fix hypoplasia and can worsen sensitivity, so ask a dentist before trying it. The tooth fillings page explains how restoration works in general.