My child has always sucked her thumb, even though I've tried to get her to stop. Is this a problem? And how do I get her to stop?

Thumb sucking is natural up to the age of three or four. If it continues beyond the age of six, it can affect the front teeth by pushing them out so they don't bite together properly. Most children stop thumb sucking under peer pressure at primary school. Others may need to be reminded to stop by placing tape on the finger or hand, and for those who find it irresistible, a special plate can be made and worn for three to six months.