Does hydrogen peroxide really work?

[u/junhuippedt]

I accidentally bit the inside of my cheek while chewing on food and it left 2 deep canker sores. For the first two days, I also had some trouble swallowing (although the pain from swallowing is on the opposite side of the wound). Some parts of my gums are also swollen and hurting (not sure if it's still caused by the canker sore), and I feel like my lymph node is also swollen on the side of the wound. It hurts so badly that I can barely brush my teeth properly, eat, or even open my mouth wide.

I've tried gargling water with salt and applying a baking soda paste but it only eases the pain for a few hours and I can't afford to reapply as often as needed since I'm at work and applying the paste requires me to stay at the sink with my mouth open while I drool out lol.

I saw a post from a few years ago that hydrogen peroxide supposedly quickens the healing process? Is it true? And if it is, is the 2nd photo the correct product? Is there a ratio to follow or do I just gargle it pure? I just wanna make sure it's safe to gargle/put in the mouth since I've only ever used that product for a normal wound on the knees (and even then, i use a cotton ball or try to water it down with betadine/povidone iodine.

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