Having dry mouth is always troublesome, one of the effects of it is rampant decay. It is because saliva acts like a buffer and it reduces acidity bacteria producing as well as it carries mineral needed for replenishment of tooth surface. Saliva forms a film on tooth suface and protects it agaist loss of mineral too. One the reasons for getting dry mouth is medicines. We can always ask our pharmacist if this is the case and if so, we can ask our doctors if there is an alternative drug to take, one which does not cause dry mouth. The other one is systemic diseases like diabetes or HIV infection as well as autoimmune disorders such as lupus.
Suggested protocol for dentists and patients for preventing tooth decay caused by dry mouth is as follows according to an article printed on Journal of Canadian Dental Association 2011;77:b85:
” Using remineralization paste and chewing gum containing Recaldent to replenish calcium and phosphate ions
Using high-fluoride varnish once every 1 to 3 months to reduce the susceptibility of enamel to acid challenges
Using high-fluoride-containing toothpaste and rinse daily, with monitoring for signs of fluorosis and patient compliance
Chewing xylitol gum up to 5 times a day for 5 minutes each time to reduce acid production by bacteria, and increase saliva and oral comfort
Taking medications, inclusing pilocarpine, bethanechol or Sialor, to induce salivary flow and increase comfort for those with residual salivary gland function
Using products made by Biotene for comfort and paossible anti-bacterial activities
Brusing teeth carefully to remove any plague and residual food particles with either a manual brush or and electirc brush with an oscillating and rotating head, and possibly using a Waterpik to replace floss, as patients prefer
Changing to a diet low in sugar and acidic drinks
Potientially using cholorhexidine in conjunction with these other procedures
Having the patient sleep with a remineralizing agent (e.g., MI Paste, X-Pur) in medication carriers fabricated like bleaching trays to extend exposure to the agent to keep the mouth wetter at night and to provide a mechankical barrier to an acidic environment.”
I hope this helps.