Advair HFA and immune response

I have used Advair for about 4 years now. My dental hygiene has always been impeccable, but recently I have had to have three root canals in a very short period of time and my dentist has gotten very concerned about how rapidly my teeth have developed so many problems. He immediately asked if I was using an asthma inhaler and I told him about Advair. He said that drugs like this cause dry mouth at night and this reduces the immune response in the salivary glands. These root canals have come at great expense and I am experiencing a lot of dental sensitivity too. The day he told me about this I threw my diskus away! I have been using some homeopathic stuff ever since and I haven't had a problem. My dentist told me to send my recent bills - some $6,000 - to my asthma doctor and ask her to pay for them!! Can't wait for that appointment. :-))