Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Broke Tooth

I have healthy 45 year old teeth and broke a large chuck off my front tooth eating this cereal. The chunks in my box reminded me of gravel it was so hard. I have never purchased this cereal before and so not sure if I just got a bad box or this is the normal for it. I have contacted the vendor to try to find out. Watch out for hard chunks hard enough to break your teeth.