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How do i get rid of these brown stains that are between some of my teeth pretty please?

Hey! About a year and a bit ago i recognized that not between my two front teeth but between the tooth next to it some brown substence was appearing, but it was very slight so i just thought it was like that already. Some time later the brown substence ran the whole length down between it. I think it was soon after this happened, just over night i got brown substence between 4 of my bottom front teeth as well. The bottom teeth were fine before i went to sleep, but when i woke up this brown substence was there. I was in panic and immediately rang my dentist who booked me an appointment but they kept on delaying the appointment for a further 3 months and in this time i received some more brown substence. This next one was located not between my front two teeth, but the tooth next to it, and then soon after that i had brown substence between my front two teeth as well. Eventually, the dentist stopped delaying my appointments and i managed to go there. They did something that removed a bit of it, but in time it came back. Somebody told me that i should start flossing and cleaning my tongue with a tongue cleaner but i had never heard of flossing and tongue cleaning before this, so i started to do it and in time it reduced. I was also using mouth wash to help it go away. When i went to the dentist again, he used something between my teeth and said that he removed all the plaque that was behind and between my teeth, but the brown stains remained. Please can anyone tell me how to get rid of these brown stains between my teeth? I've not been going out and seeing my friends much for the past year due to this and also my personality has completed changed because i'm constantly thinking about it and don't want to smile. You can only really see it when your close up but still, it's there and i won't be myself again till its removed. Oh, and before it happened i brushed twice a day, 5 minutes at a time and i was cleaning my teeth correctly so it wasn't due to brushing. If anyone can tell me how i can get rid of this brown staining and get my life back on track that would be fantastic and i'd owe you so much, thank you :)