Thumb sucking: many of us did it at one point in time. It is a comforting feeling for many babies, but there does come a point where a child needs to move away from thumb sucking for a number of reasons. One potential issue with extensive thumb sucking is problems with their teeth. There is a very specific connection between thumb sucking and tooth position. So if you have a child who sucks their thumb, or if you’re considering having a baby and want to know how best to care for your child, here is what you need to know regarding thumb sucking and teeth.