**Core Concept**
Perikymata are small, transverse ridges or lines on the surface of a tooth, typically found on the enamel surface of the tooth. They represent the growth increments of the enamel, which is formed through the process of amelogenesis. Perikymata are formed due to the periodic cessation of enamel growth, resulting in a visible line or ridge on the enamel surface.

**Why the Correct Answer is Right**
Perikymata are formed due to the periodic cessation of enamel growth, which occurs every 10-14 days. This results in a visible line or ridge on the enamel surface, which is the perikymata. The growth increments of the enamel are a result of the continuous deposition of enamel matrix by ameloblasts, which are specialized cells that produce enamel. The periodic cessation of enamel growth is caused by a decrease in the activity of ameloblasts, resulting in a visible line or ridge on the enamel surface.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because perikymata are not related to the shape of the tooth. While the shape of the tooth can affect the visibility of perikymata, it is not a factor in their formation.

**Option B:** This option is incorrect because perikymata are not a result of enamel resorption. Enamel resorption is a process in which the enamel is broken down, whereas perikymata are a result of the periodic cessation of enamel growth.

**Option C:** This option is incorrect because perikymata are not a result of the deposition of dentin. Dentin is a layer of tissue that lies beneath the enamel and is formed through a different process than enamel growth.

**Clinical Pearl / High-Yield Fact**
Perikymata can be used as an indicator of the age of a tooth, as they represent the growth increments of the enamel. By counting the number of perikymata, dentists can estimate the age of a tooth and determine its developmental history.

**Correct Answer:**