Hi John, I watched a T scan video on you tube. My opinion of this is that it's totally reliant on the data that has been fed into it by humans. So it will be based on the same pre-set notions of what constitutes a perfect bite (the text book bite). In my opinion, and I'm not a dental professional but I do have a fair bit of experience of what can go wrong, the text book bite is a myth. Every individual is going to be comfortable with a different bite because we are all different. Some people are very happy with what a textbook defines as dysfunctional bite. They are not only happy but have no dental issues, decay or pain. The brain is programmed to expect teeth to be in certain positions and once you start to adjust them the memory of that programming leads to long-term dissatisfaction whenever the jaws come into contact. So the muscles contract more to try to find it and this leads to different bite problems and added stress. So in my humble opinion dentists should not be adjusting down the bite unless there are exceptional circumstances.
You cannot replace what nature has created. Once you start having crowns and other restorations you can start to build in a bite problem for the future, particularly when you have a large amount of work in one session. If you then start to grind down the bite there's more pressure in areas that may be weaker than necessary to sustain it. A dentist cannot feel the areas of weakness but your mouth can. Trying to then go back and build up again can lead to cracked teeth as restorations are never the same as the original cusps. Changing one thing in a bite affects numerous other areas. There are too many variables involved to make this a regular option for a dental professional. It can affect the TMJ and muscles, but also the neck, shoulders and back. How can a dentist predict what it affects? It takes an exceptional individual to understand the bite and make successful changes.
From what you've said your problem is sensitivity following the fluoride treatment. This may have led to you changing your muscle action to avoid the sensitive teeth so it may now feel like you have a bite problem, but what you might be doing is changing all the behaviour of the jaw to avoid pain. So you have maybe formed new habits that have affected your alignment. Then you had a bite adjustment and we don't know how much that has contributed to your subsequent problems.
You can have a bite guard that is soft inside and hard outside. The hard outside bit is a good idea for diagnosis. Bear in mind that it's extremely difficult to adjust a hard guard so that someone with sensitive teeth is comfortable. Some dentists are gifted in intuitively adjusting, others are not. Listening to the patient is important for successful adjustments.