The importance of replacing missing back teeth (your molar teeth) cannot be over-emphasised as these are the large multi-rooted teeth that are designed to do the main work of chewing your food. They are your grinding and crunching teeth – the power-houses of your bite!
When molar teeth have been lost all of this chewing workload gets transferred to the single-rooted teeth at the front of your mouth (your food has to be chewed by something!) These front teeth are simply not designed to grind and crunch food in the way your molar teeth are and these excess stresses on your front teeth will inevitably cause damage in the long-term.