Do you think I have a cavity? Help?

Have you been able to look at it to make sure that you have not chipped it a little. Sometimes we may get a little chip, but it feels huge because any change in the mouth is a major one. Check that first. Then make sure to brush with fluoride toothpaste, they are making some now, in washington at least, that are almost 5%, then floss regularly and buy some mouth rinse that has fluoride in it. Also, there is an ingrediant in some gum that is very good for strengthening teeth, it is called zylatol. If you like gum, change to that and it will also help. Bottom line though is that if you have not been to a Dentist for your regular check ups, that should be the first thing that you do.