If they are flat mouthguards, they should work. Keep in mind that they are often more expensive than Reviv. Also one advantage of Reviv is, because of the philosophy and knowledge of biomechanics, the mouthguards are designed to be worn various hours during the day and during sleep. Because of this the R3 for example, doesn't touch the gums at all (better comfort), provides a better saliva flow system, it's thicker (meaning a bigger stretch, so faster progress), etc. https://get-remodel.com/products/r3-mouthguard-by-santi Apart from that, any flat splint follows the it starts with the mouth principle and improves biomechanics :)

Any flat splint/mouthguard works. Make sure it's not indexed. Meaning, don't boil it and lock one bite. More information in the classroom

@Lucas Rossi Indexed means that it locks a specific bite. You want the mouthguard to be flat, meaning the jaws are free to move. By adding dental height (a "separation" between the mandible and the maxilla) plus unlocking the bite, it releases and stretches the soft tissue of the skull, which then "inflates" like a balloon and pulls on structures like bone, bringing them to their genetically determined placement. Because of this any flat mouthguard regardless of the size will help you

Stick with it. Most likely you were used to the TMJ pain before, and now that you haven't experienced it for a while with Reviv, it feels "stronger". Eventually you'll completely get over it. But for now, you should keep wearing the device.

@Julian Jorge Many people have some degree of TMJ dysfunction without knowing it. I'd keep wearing the mouthguard and progressing

You can keep your progress by wearing a flat mouthguard, during the process of stretching your tongue and widening your palate. It's the same biomechanics of Reviv, thumbpulling or mewing, just that the former is easier for everyone to do. More info: https://get-remodel.com/pages/santiago