Walking, you tend not to move alot
Answer:
natural ammunity
Explanation:
immunity possessed by a species or race that is present in an individual at birth prior to exposure to a pathogen or antigen.
Answer: Peers
Other people for example if they are smoking that can harm you by second hand smoking or persuasion for you to smoke.
Peers can also effect you emotionally by making you cry and angry.
Try chewing some gum, of your choice,
don't use mouthwash for a bit (the alcohol can make your mouth drier)
reduce your caffeine intake, stay away from caffeinated drinks like coffee, and even soda.