Hello , my name isXXXXX and I will try my best to provide you with the answer to your question.
Grinding can be caused by many things and to cure it you would have to find what it causing it in your case. You are absolutely right about the mouth guard. It is mainly a device to prevent damage and treat symptoms but it does not generally cure the underlying cause.
Some things that cause grinding and options for help are:
1. Stress. This is a very common cause and particularly with young people transitioning to colleges or the job market. If it were stress related I would advise counseling, yoga, massage and the like to reduce your stress level. Exercise and a positive attitude help.
2. Drug use . Amphetimines like adderol can be responsible. Options if this were the case would be to change or stop these kinds of medicines/drug usage.
3. Bad bite relation. This is a common problem and patients seem to want to 'grind' in a better occlusal relationship because the one they are in is uncomfortable. This might be what you are experiencing and the options would be occlusal adjustment, restorative work like fillings
, onlays or crowns
depending on the damage done to the teeth already.
I would not recommend occlusal adjustment at your age because it is extremely difficult to get right and takes a specialist to do.
Another option would be to have orthodontics
. If you have any crooked or missing or crowding that will effect your bite in many ways.
I hope this helps . Please ask more if I can help you further.