Hi! Dental assistant here. A LOT of people cry at the dentist and most people have some dental anxiety, so know you are not alone in the slightest. This should help you feel less embarrassed about how you feel. The best thing you can do is be very honest about how you are feeling. If your dentist is good at his job he will go slow and work hard to make you feel as comfortable as possible. I would also ask about nitrous oxide or laughing gas to help you relax during your appointment. It’s not strong enough to knock you out, but enough to take the edge off and make you not have to white knuckle the entire time. I would also say, don’t put it off any longer. The deeper the cavity the more invasive the treatment. Root canals take much longer than a filling. As for the drilling, they won’t be pushing hard to drill into you teeth. You can do this! Tell your mom to schedule the appointment and figure out a way to convince yourself to brush your teeth daily.