How to stop baby (with teeth) from biting during latching???

Talking to them definitely helps. They may be very young like 6 mths old but trust me, they understand us as much as our elder child does. The only thing is that they can speak like us yet. They will talk to us in their baby language which we don't understand. Taking this opportunity, we will have to educate them it hurts to bite. This isn't right. Give them teether and tell them that he/she can bite on this if they want. Nipples are meant for milk only and can only suck.