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If you are curious to know how much toothpaste can you bring on a plane then the rule of TSA 3-1-1 answers your question. Airlines allow upto 3.4 ounces of liquid and gels in any form, it can be in the form of water, juices, toothpaste, shampoos, hair conditioners, hair gels, etc. Any amount exceeding this limit will be charged extra.
