I'm terrified!

[IzzyWhizz]

I've just made myself my first dentist appointment in years! I'm absolutely terrified that I've ruined my teeth!
I can see black marks in the pits and fissures of almost all of my molars and premolars, could this be decay? What should I expect when I visit you the dentist?
Here are some pictures to give you some idea of how they look, do you think I'll need a lot of fillings?

 

[drmins]

Nothing to be terrified about. First have your scaling (cleaning) done. Fill those cavities that are present, and not all black discolorations. Use a remineralising tooth paste.
If you can afford, get an orthodontic correction for your irregularly arranged tooth.

 

[IzzyWhizz]

Thank you so much for your advice. Less than a week until my appointment now, I'm very nervous, but also anxious to find out how many cavities I really have! ​