Is baby chewing through normal?

My sister in law adn my sister both tooked the bottle away from their children when the started to chew off the . My son is only 4 months so I have a while but my son is going to be off the bottle at 1 nomatter what.If your son can drink a sippy cup give it too him.Just put formula in it at bed time and he will go to sleep.It is better to stop a baby at a young age at like11 or 12 months with the bottle and the pacifiers cuz when they get older it well be harder.Good luck.Try a sippy cup.See if he likes that better.