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So no I would not recommend a hydrogen peroxide rinse an the reason for that is its cytotoxic (kills all cells- your healthy ones and bacteria). Sometimes older dental practitioners recommend this but it is not a common practice currently. Excess saliva is actually a good thing in regards ***** ***** your oral health so that isn't a huge concern. Receeding gums could be caused by grinding teeth (bruxism), brushing too hard, or using a toothpaste that is too abrasive, and of course recession can be caused by gingivitis or periodontal disease. If you are seeing your dentist regularly, you are hopefully in good dental health however. If your gingival irritation is generalized everywhere you may want to try a different toothpaste, possibly even an organic type toothpaste that doesn't have as many preservatives. If its just a single site that is irritated, you may want to get a second opinion just to make sure your dentist hasn't missed something. Hopefully that makes sense.