The teeth that grow twice in the life of humans, according to the provided reference, are incisors, canines, and 2 molars.
In human dentition, most teeth emerge in two sets: a primary set (often called "baby teeth" or deciduous teeth) and a secondary set (permanent teeth). The reference specifies that the types of teeth belonging to this category are the incisors, canines, and a specific number of molars.
According to the reference, the types of teeth that grow twice include:
- Incisors: These are typically the front teeth used for cutting food.
- Canines: Also known as cuspids, these pointed teeth are used for tearing.
- 2 Molars: While most dental sources indicate that primary molars are replaced by permanent premolars and permanent molars erupt only once, the provided reference explicitly states that "2 molars" grow twice.
The reference also notes that based on these types, the total number of teeth that grow twice is 20. This number represents the set of teeth that are replaced during a person's lifetime.
