REMplenish is designed with a slit connecting the two small holes. This provides the resistance that creates the exercise and is completely normal. If you see the slit is torn or extending outside of the two holes, REMplenish may be replaced under the 3-month nozzle warranty. Please fill out the customer support form for a replacement, selecting "Issue with your REMplenish product". You will be asked to provide a photo of the nozzle for quality control and R&D purposes. REMplenish is not strong enough to withstand a chewing habit and will not be replaced for misuse.