People who don’t produce enough saliva struggle a great deal to eat and swallow their food. Saliva production can be impaired by some cancer treatments or autoimmune diseases, this is when something disturbs your immune system and your own body attacks and destroys your own tissues. There is a condition called Sjogren’s Disease and it is known for destroying your salivary glands. And also you can get reduced production of saliva due to medications like anti allergy and cold medications.