If you dream about flossing your teeth, it's possible that you are trying to deal with an issue or solve a problem in your waking life. Or perhaps you are preparing to cope with something that is concerning or bothering you.
If you make your gums bleed from flossing in a dream it's possible that you have had a loss of some type lately or anticipate one in the near future. Someone may have hurt you or perhaps you have hurt yourself. You may have seen this coming or it might have come as a total surprise but you are hurting nevertheless.
It could also represent your fears about a some negativity in your life and the consequences of your actions. Can you stop something in its tracks now? You may still have time to reverse the effects of something you've done.
Another point of view is that you are trying to get to the root of something and digging deep to find it. Your consistency might just pay off.
Perhaps you are concerned about your appearance and how you look to others. You may feel you need to pay closer attention to your routine or have been in order to impress those around you. Why aren't you making these changes for yourself? Do you need to change at all? If you are happy with the routines you have put in place- then why not keep them?
You may also feel a desire to have some routine and consistency in your life now if it has been erratic until recently. On the other hand, you may have a very solid routine and you fear that breaking it will cause you trouble later down the line. Or maybe you desperately want you shake up your routine, if you feel it's stopping you from living your life to the fullest.