From what we can gather, this is not usually the case. Most of the silicone used is both food- and medical-grade. Medical-grade silicone is built to last and withstand use for years to come. That said, this doesn’t mean that precautions aren’t necessary. When items are put in the dishwasher too often, the structural integrity of them can become compromised by excess heat. This is also the case when sterilizing objects, too. So, if possible handwash your items and air dry them more frequently than opting to throw them in the dishwasher all the time.