No one can catch a sinus infection from another person, but the viruses and bacteria that cause colds and other respiratory tract * infections that can trigger sinusitis may spread from person to person in drops of fluid from the nose or mouth.
We call the major salivary glands the parotid, submandibular, and sublingual glands. They all secrete saliva into your mouth, the parotid through tubes that drain saliva, called salivary ducts, near your upper teeth, submandibular under your tongue, and the sublingual through many ducts in the floor of your mouth.
In addition to these glands, there are hundreds of tiny glands called minor salivary glands located in the lips, inner cheek area (buccal mucosa) and extensively in other linings of the mouth and throat. Salivary glands produce the saliva used to moisten your mouth, initiate digestion, and help protect teeth from decay.