It is called the LVI as you know. It is glued in, cause if it wasn't I would have taken it out by now! I have read that splints only work if you wear tehm 24/7, which I never did, so this made sense to me, at least to try. It looks like veneers except not quite as pretty, but it looks like teeth. I am only wearing a lower one right now and it is only on the back teeth on both sides. It builds them up to about twice their height. I have a crossbite and rally bad malocclusion, so my dentist says he is 90% sure my TMJ pain is from that. My neck and shoulders, even my back, have trigger points I can feel. Today is day 3 with it, and it hurts, although it is hard to tell if it is the same pain as usual, or my muscles re-adjusting. My dentist called yesterday and said the first few days can be rough. Well, I have had this for a good 10 years so I guess it may take some time to re-train my body. And, it feels really weird to chew, so I am living on Smoothies, let me tell you, the TMJ diet is fabulous, I have lost about 15 pounds in the last year!