In which part of the mouth is the parotid gland primarily located?

The parotid gland is primarily located inside the cheek, specifically near the upper molars. This major salivary gland is significant because it produces a large portion of the saliva that helps in the initial stages of digestion and oral health. The duct of the parotid gland, known as the Stensen's duct, opens into the oral cavity at the second maxillary molar, which further exemplifies its positioning within the cheek area.

The other locations mentioned do not accurately describe the parotid gland's placement. Under the tongue is where the sublingual gland is situated. Near the alveolar ridge refers more to the area where teeth are located, while alongside the gums is typically more related to the gingival tissue and not the major salivary glands. Therefore, being aware of the precise anatomical location of the parotid gland aids in understanding both its functionality and its role in dental health and procedures.