White spots on tooth?

I noticed a couple days ago that one side of my mouth seemed a little sensitive to cold drinks. When I took a look, one of my back teeth had white dots on it. I did some looking online and it says that it could be decalcified enamel and that it could lead to tooth decay. I'm a bit confused though, do I actually have a cavity or just the beginning of one? Will using flouride toothpaste and going to get a flouride treatment reverse the problem or just stop it in its tracks? What's the best way to deal with this? I'd really rather not get an entire tooth pulled. Please help.

White spots on tooth?
That area has been weakened and is susceptible to decay. It may not yet have an actual cavity, but the protective enamel has been damaged. you won't reverse it, but using a flouride rinse and practicing good dental hygiene will prevent any further damage. Having sensitivity to cold may be indicative of a cavity. You should see your dentist to have it looked at, and taken care of. you won't have to lose your whole tooth. At worst you'll get a filling.
Reply:when i was in dental asstants class, the teacher was talking to me the white spots it may cause by too much flouride, you can't do nothing it may go away later.