I chew sugar free gum after meals to help the saliva flow and protect my teeth .
Mostly I have either artificial saliva gel or spray, as I buy the annual prescription card I like to get my monies worth so ask my dentist for a prescription for gel and fluoride toothpaste. you can buy it over the counter.
If you have a dry mouth likely not making much saliva and this can be a factor in tooth decay. My dentist recommended an increased fluoride toothpaste brush twice a day, and twice a day at different times use a mouthwash. your dentist will give you the best advice, but I am of course making the assumption you have your own teeth,
Hope this helps