I would check his teeth, and for any foreign object that could be caught between them.
Drooling can also be a sign of nausea, or a problem with the salivary glands.
Not all those who wander are lost.
Life is just a leap of faith.
Spread your arms and hold your breath and always trust your cape.
Two things define you. Your patience when you have nothing, and your attitude when you have everything.