We are a BODY. Just think what happens when you neglect any part of your body. The other parts step up to try hard and compensate for it but ultimately, your neglect will cause it to wither and die. The teeth can't say, "I'm not responsible for the mouth, that's the mouth's problem". It's the teeth's JOB to breakdown what the mouth has in it. The tongue can't say, "I'm not responsible for the stomach, that's the stomach's issue, not mine." It's the tongue's JOB to taste what is being sent to the stomach as a filter to let the rest of the body know what to expect or what is coming into the digestive system. Seen?