No matter how long or short the preparation time, hot or cold water, or the exactness of following the instructions, these splints will not provide the tight seal on the teeth that a quality tooth gel requires. It is wasted. If you only want the top, maybe, but these trays will NOT fit the bottom. Too loose and they won't form to save your life. Only gave 2 stars because they worked pretty well for the bite protection on the upper.
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