Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your question first of all I would like to tell you that it will be better to consult an Orthodontist or any other dentist as your dentist does not seems to be doing justice with you.. Now answering your questions point wise.. 1. If you have teeth grinding habit secondary to stress you definitely need a Mouth Guard and custum made are the best fitted and an Orthodontist will definitely get one fabricated for you.. The one you are wearing right now might have sharp areas ver the tissue surface causing injury to the gums so either get the areas trimmed or stp wearing till you get a proper fitted fabricated.. Over the use gums apply a numbing gel containing Lignocaine to relieve pain and discomfort.. Cold compresses can be done to reduce inflammation and swelling.. 2.If your canine has become loose t needs immediate attention and splinting atan early stage can prevent further mobility.. 3.For stress you can do meditation to reduce stress and engage in the activities of your choice.. At times anti-anxiety medication can be prescribed by a physician.. If you have any further queries feel free to ask by asking a direct question to me by going to my profile.. Hope this information helps.. Thanks and regards.. Dr.Honey Nandwani ..