Dreams about entering dark places where the lights won't turn on can often symbolize feelings of uncertainty, fear, or a lack of control in your life. The recurring theme of darkness suggests that there may be areas in your waking life where you feel lost or unable to see clearly, particularly in relationships or situations that are troubling you.

In your specific dream, the setting of your parents' house and the presence of your brother, with whom you have a complicated relationship, could indicate unresolved tensions. The act of trying to brush your teeth in darkness may symbolize a desire for self-care or personal clarity, yet feeling hindered by the circumstances around you.

The fact that the lights flicker or don't turn on at all can reflect feelings of frustration or helplessness. You may be trying to navigate a situation where you feel that your efforts to find clarity or connection are being thwarted.

To gain insight from this recurring dream, consider reflecting on your current relationships and any underlying issues that may be causing you distress. It might be helpful to address these feelings directly in your waking life, whether through communication, setting boundaries, or seeking support from others. Engaging with your emotions and seeking light—symbolically speaking—can help you find the clarity and understanding you seek.