Can excessive cleaning harm my teeth? i brush for 2 min. , use mouth wash and floss before i go to bed? is this fine?

Good hygiene: I commend you for putting in the time. You should use a soft toothbrush and see a dentist to make sure you are not over doing it.

Brushing harm: There is some data to indicate that over many years toothpaste can erode tooth structure.

2 mins and soft : Brushing too aggressively and/or using a hard bristle brush can cause the gums to receed, which can lead to a litany of problems. Using a soft bristle brush with light pressure for 2 mins is what's recommended. Remember to angle the bristles so that they contact where the gums and teeth meet and to use small circular motions.