Thread: Canker sores suck
Betadine sore throat spray works wonders on those buggers.

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Just spray them with this and within a day they'll stop swelling be gone soon.

Alternatively, you could apply charcoal toothpaste on them.

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Rinse with 1.5% hydrogen peroxide. You'll never get one again lol. You buy the 3% stuff at the store and just mix equal part water and peroxide.