Parotid gland and duct
The parotid glands are the largest salivary glands. They are located just in front of the ears. The saliva produced in these glands is secreted into the mouth from a duct (Stensen's duct) near the upper second molar.
Meanwhile, Sublingual glands reside beneath the tongue and supply saliva to the floor of the mouth.
Submandibular Gland and duct
The submandibular glands are found on both sides of the mouth, just under and deep to the jaw, towards the back of the mouth. This gland produces roughly seventy percent of the saliva in the mouth. The submandibular duct, called Warthin's duct, enters the floor of the mouth under the front of the tongue.