An increased salivary secretion in termed as sialorrhea or ptyalism. 

Mechanisms

• The secretory innervation of the salivary glands is primarily under the control of the parasympathetic nervous system.
  

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• Stimulation of the parasympathetic system causes profuse secretion of watery saliva.
  

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• Some person are unable to swallow their saliva fast enough to prevent drooling

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