Saliva plays an important part in keeping your mouth clean. If your mouth always feel dry, you need to hydrate more regularly and use antibacterial rinses to make up for the lack of saliva. If you take any medication, look up a list of side effects to find out if your medication could be causing your mouth to be dry.
Strengthen your existing enamel with the foods that you eat. Certain vitamins and the mineral calcium, in particular, all help out with this. Foods that are good to accomplish this with include nuts, meats and dairy choices. Avoid sugary foods, soft drinks and sweetened teas, as these will do immediate damage to your enamel.