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If you cannot see the mobility, but only feel it, then usually we dentist will not take it as an emergency as such mobility can occur for a few days to weeks depending upon our hormonal condition or wisdom tooth eruption or by periodontal disease.Mobility in periodontal disease will be of a higher degree, which is visible to the naked eye. Periodontal disease will have swollen and loose gums with much mobility and I assume you do not have it. Check whether there are some calculus deposits. If yes, then get them cleaned. You should continue with the salt water gargle. Also, use good remineralization toothpaste if available. Teeth will never fall out so easily at this age, so do not worry about it. There is no such disease or condition where it will just fall off without any specific reason. Did you have any history of a fall or accident before, which might have caused injury to teeth?