Difference between tether and pacifier and when to introduce and which kind of pacifier

A. Teether is usually given to the child when the child starts to habit teeth so kids can bite onto that and it’s a completely suitable thing to be given where even you talk about a pacifier it is like a nipple that you put into your child’s mouth your child is sucking onto it throughout the day and not crying because of it’s a very filly addiction that you can give to the child and it has a lot of side-effects as well