Depending on dietary and health factors, saliva can be an acid, a base or neutral. If the body operates within a normal range, the pH level of saliva stays between 6.5 and 6.8, which makes it slightly acidic.
A pH level of seven is often considered neutral. A pH level of zero through seven is acidic. A seven to 14 pH level is a base. If the pH level of saliva falls below 6.5, it is considered to be too low. This may be a result of the body producing too many acids or the body not being able to handle the acids being introduced because it is incapable of sufficiently removing the acid through urine.