CHRIS - I applogize for not replying sooner. I didn't see a red icon (indicating new post) next to the new blue question mark icon. When I read the title, I realized I hadn't responded.
Recurrent dreams usually have some meaning. They are thoughts in your unconscious mind rising to your conscious mind. Typically they stay burried until you're prepared to deal with them without upsetting or overwhelming your ego. (In other words, some thoughts aren't allowed to surface until you're ready to deal with them). Other times the dreams are about what you're actively thinking about.
Given that your father died 09/2001, the two year anniversary of his death is probably on your mind. Death of a parent is terrible to start, and coupled with the terrorist attack in the same month, you must have been through hell.
Here's my interpretation. Of course it would be far more accurate if I knew you.
A private house may represent to you feelings of safety and security. The bathroom is a sort of inner intimate sanctum to many people (as they perform their private biological functions there)
You're looking in the mirror examing yourself, your life and sense of worth and accomplishment (sparked by wondering how your dad would feel about you now). You're struck by a desire to brush your teeth, which can be interpreted as an atypical form of cleansing or removing guilt and/or bad feelings. You're using your dad's toothbrush, as you miss him, and on some level are attempting to emulate him in a relatively trivial yet intimate act of brushing your teeth. You're concerned that he wouldnt want you to use his toothbrush seems to be a fear of not meeting his expectations, tied into the introspective feelings of self examiniation in the mirrror.
You have a recurrent immage here of cleansing something, (first the teeth now the toothbrush with hot water) figuring that all will be made right following this cleansing with the "really hot water." This reinforces the idea that there is some sense of guilt or perhaps fear that you haven't cleansed yourself from (most likely) not living up to your father's expectations, or perhaps more likely given the nature of his death, not being able to do anything for him. You were only able to stand by and watch him die. You could provide no cure, b/c there was no cure.
The feeling of guilt expressed in the dream is again reinforced because at the end of your dream, the door is opened and you're "caught" or "exposed" to scrutiny by others, in a place you thought private.
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