Types of SPD and drooling?

by Melody
(Texas)

hi. my son is 6 and he still has excessive spit and drool like a baby would. He is in speech and occupational therapy at school.

he speaks pretty well and has no learning disorders. he has adhd and spd. he likes noise, hums and makes noise constantly, he's bad at regulating his volume, he likes rough touch and rough play..likes hugs or being squeezed..he dislikes smells and will hardly eat anything.

Are there different types of spd? one type where kids are overly sensitive and one where kids are under sensitive? what do you call these different spd spectrums?

no one at the school or any doctor i take him to really has much info for me... is it normal for spd kids to drool so much?