She does not go under the gum line, I think it might be ok as a in between but if you are paying for a in between why not do it yourself or pay to get it done right, dogs don't have smokers tint or coffee tint, to me it is a waste of money that could be put towards a full dental or etc. and I agree with Carol. Just my 2 cents whatever it is worth, but I would not rush my dogs to her when their is so many other things we could put the money to good use for, but on a positive note the peroxide is a "GREAT" idea.