hi susan, i had those when i was in hospital recovering from surgery to ease my excess saliva issue and they had some effect for that. unfortunately they werent subsidised and were about $18nz each so didnt go on with them after i was discharged.

45 yrs. peg tube jan 07/09 TOTAL GLOSSECTOMY jan 12/09
T3NOscc oral(ex smoker )
open tracheostomy , removed oct 12/09
modified neck dissection lymph nodes I to IV
rectus abdominal flap + full dental removal
30 day radiation treatment ,diagnosed with lung cancer oct 2011