According NewScientist, the DNA from a man's saliva can be detected in the saliva of a woman he kissed up to an hour after the kiss occurred. This was revealed by a study that was conducted at Comenius University in Slovakia.
The enzymes in saliva initiate the digestion process of ingested food and break down food particles that accumulate in dental crevices, protecting teeth from bacterial decay. Saliva also functions as a lubricant, permitting swallowing and preventing desiccation of the digestive tract.
The average human mouth produces approximately 2 to 4 pints of saliva a day. Saliva is produced by several major and minor glands located in different areas in the mouth and circulates through tubes known as salivary ducts.
Thick saliva occurs when the body has a hard time producing enough of it, which is often a side effect of prescription and over-the-counter drugs, according to Medical Daily. The most common types of medications that produce thick saliva are for allergy, cold and pain.
Excessive saliva is caused by an increase in the body’s saliva production or a decrease in a person’s ability to swallow or keep saliva in the mouth, says Mayo Clinic. Some causes of increased saliva production include improperly fit dentures, gastroesophageal reflux disease and a mouth or throat in
Salivary amylase, also referred to as ptyalin, is the name of the enzyme found in saliva. Digestion of food begins in the mouth, and this enzyme is instrumental in beginning this process.
According to the Centers for Disease Control and Prevention, HIV is not spread through saliva. HIV is not transmittable through close contact such as kissing, hugging and using the same dishes or drinking glasses.
Healthy saliva is neutral and non-acidic, with a PH reading of 7.0 or higher. The PH of saliva can change depending on what food and beverages are consumed.
Cat saliva that accidentally comes into contact with human nose, eye and mouth membranes may cause skin infections, flu-like symptoms and sometimes meningitis. Most of these conditions respond well to antibiotics.
Common causes for thick and sticky saliva include dehydration, Sjogren's syndrome, dry mouth syndrome, sarcoidosis, iron poisoning and cystic fibrosis. Abnormally thick and sticky saliva is usually accompanied by other symptoms in all of these conditions, states WebMD.