Whilst every situation must be evaluated and handled individually, generally you are much better off keeping your natural teeth. Teeth are important for chewing, which of course is important for good nutrition. They also aid in our appearance and in the way we form our words. Teeth support each other, like stones in an archway, when one is removed it can have a negative domino affect on the position and function of the remaining healthy teeth. Usually, while less expensive in the short run, losing a tooth that could otherwise be saved with root canal treatment ends up costing more in the long run both in terms of money and dental health.