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Some herbs may help shorten the length of a cold or possibly lessen your chances of getting one, which might also help your throat if your laryngitis is due to a cold. 1  Honey -- Honey has been used traditionally to soothe a sore or irritated throat.
Use tea tree oil as a mouthwash with extreme caution. Tea tree oil is great at soothing sores and easing pain, but it is also very toxic if swallowed. If you are careful, you can use it as a mouthwash. Make a gargle solution to treat laryngitis and canker sores. Combine 1 cup (240 milliliters) of warm water with 3 to 4 drops of tea tree oil.