First permanent teeth to erupt is: September 2008
**Core Concept**
The question is testing the knowledge of dental anatomy and development, specifically the sequence of eruption of permanent teeth. The permanent dentition typically begins to erupt when the child is around 6 years old, replacing the primary teeth.
**Why the Correct Answer is Right**
The first permanent teeth to erupt are the first molars, also known as the six-year molars. These teeth are located at the back of the mouth, near the second molars. The eruption of the first molars marks the beginning of the permanent dentition. This process is facilitated by the root resorption of the primary teeth and the gradual movement of the permanent teeth into the oral cavity.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the first permanent teeth to erupt are not the central incisors. The central incisors are among the primary teeth that are replaced by the permanent incisors, which erupt later in the sequence.
**Option B:** This option is incorrect because the first permanent teeth to erupt are not the first premolars. The first premolars, also known as the bicuspids, erupt later in the sequence, usually after the first molars.
**Option C:** This option is incorrect because the first permanent teeth to erupt are not the canines. The canines, also known as the cuspids, erupt later in the sequence, usually after the first premolars.
**Option D:** This option is incorrect because the first permanent teeth to erupt are not the third molars. The third molars, also known as the wisdom teeth, are the last teeth to erupt and may not erupt at all in some individuals.
**Clinical Pearl / High-Yield Fact**
The eruption of the first permanent teeth is an important milestone in dental development, marking the beginning of the permanent dentition. This process can be influenced by various factors, including genetics, nutrition, and oral hygiene.
**Correct Answer: C. Canines. Canines are among the primary teeth that are replaced by the permanent incisors and premolars, and are not part of the first permanent teeth to erupt.