I've never had either (and I'm almost 40), but I suspect I have my first cavity in.....my front tooth?!? WTH? I've had sensitivity in my front tooth for about a week now, and I can see a little tiny dark spot on the front surface. I know I need to call the dentist Monday, but.... A cavity scares me enough - I've never had one, but what if it needs a (gasp!) root canal? Very worried! Thoughts or experiences?