Dreams about having big gaping cavities and teeth falling out often relate to feelings of insecurity or vulnerability. Teeth in dreams are commonly associated with self-esteem, confidence, and communication. If you are experiencing issues with your teeth in a dream, it may symbolize concerns about your appearance, fear of aging, or anxiety about how others perceive you.

Cavities can represent unresolved issues or feelings of neglect in some area of your life. You might be feeling overwhelmed by problems that you haven't addressed, leading to a sense of decay or deterioration.

Overall, this dream may be urging you to reflect on your self-image and any underlying worries you have. It could be beneficial to consider areas in your life where you feel insecure or neglected and take steps to address those feelings.