So happy this worked!! I have some ridges in my 2 front teeth where I get coffee/tea stains that are very hard to remove. I followed what one reader said: put 4 drops of peppermint essential oil and add some baking soda to a cotton pad. I then scrubbed my 2 front teeth for 1-2 mins. It got most of it off, but not all. Then I added 4 drops of the peppermint oil to a q-tip and added some baking soda as well. I scrubbed on the area for another 1-2min. It worked! Stains came off and my teeth look amazing. So thrilled!! Note that you do need to scrub for a bit....it doesnt just come off once it comes in contact with the oil/baking soda mixture.I am not sure how safe this is for the enamel of the teeth, so I wouldn't do it too often. Saved me another trip to the dentist (will use this in between deep cleanings! ).