Hello and thanks for the good feedback. The subject has been discussed several times with the marketing authorization holder, in this case the manufacturer. According to the information received from them, during the corona period and now after the corona period, the US suppliers of thermoformable polymer reduced the sales of EVA polymer to Europe, because thermoformable polymers are used e.g. in various hospital supplies, of which there have been widespread availability problems worldwide. As far as hospital supplies are concerned, the situation is now reportedly going in a better direction. The sales license holder has therefore had to change the prescription of the bite guards because of this, and they are waiting to receive new EVA batches from the United States to Europe. Current suppliers of EVA material from Europe produce EVA polymer similar to the previous batches, but there are always differences in the polymers between manufacturers, even though the size of the polymers and thus the thermal behavior should be approximately the same. A year ago, the heating time in bite guards was about 30 seconds, and in the current version, about 10-15 seconds. This time of keeping in hot water is not necessarily the most ideal parameter for that, because the bite guard is at best adjustable, because the internal temperature of the polymer must be right, so that the polymer's so-called glass transition has been reached, when the viscosity of the polymer changes from "hard" to formable and soft. Time is usually an easier concept for people, and thus it is in the instructions for use in the instructions for what the manufacturer strives for in terms of the functionality of their products. If there are no traces of teeth left on the bite guard after fitting, it is known that the bite guard needs to be heated longer. In general, if the bite guard is not shaped at all, the parts of the bite guard that hit the gums may feel like burning. Shaping generally reduces the risk of hitting the gums, as the plate is shaped according to the surface and arch of the tooth. In other words, the bite guard is best suited when the bite guard is soft, partly even soft and it almost sticks to a spoon or fork. The softness can be tested in water with a fork or the tip of a spoon, and the softness of the plate depends on the temperature of the water. The softness is also noticeable in the fingers, which means that the disc feels soft and adaptable and not hard. Some people have even boiled the water used to heat the bite guard with a coffee maker and wondered that the plate doesn't soften, which means we have fitters everywhere. Made in the USA, the Maximum Protection Bite guard is probably the safest option if the design of the thermoformable bite guard is difficult: https://www.narskuttelu.fi/product/66/maximum-protection-purentakisko-1-kpl