First Filling

Yesterday I got my first filling... ever.  I've never had a cavity before.  The dentist said it was a cavity in the sense that there was a cavitation, but not like the normal dental cavity.  He filled it as a precautionary measure to prevent any further damage.  He only found it after examining my teeth after my 6 month cleaning.  His hook got stuck in it.  It took all of 90 seconds to fill it.  The dentist said he wasn't sure if he should feel privileged or not to do my first dental work.  Do you see it?