What is it when you have white spots on your tongue?

Thrush. It may be an infection with candida (yeast). This is common in patients using inhalers for asthma.
Probable Fungus. Have your dentist evaluate this for Candida Albicans fungus. Reference sites: 1) http://www. Cdc. Gov/fungal/candidiasis/ 2) http://www. Healthscout. Com/ency/1/312/main. Html.