Full arch dentures are the cheapest form of replacing an entire arch of teeth but they are not necessarily the best option. Here are a few downfalls to full arch dentures that occur in nearly every situation:
Adjustments & Re-fitting & Replacement
Throughout your lifetime, dentures will need to be replaced and adjusted which can become time consuming and expensive. It is a simple fact that dentures start to become loose and can break through normal activities such as talking, eating, etc. If a denture arch breaks, it may be possible to repair but in some cases it will need to be replaced entirely.
Bone Resorption (degeneration)
If you do not replace tooth roots, the bone where the tooth roots used to be will start to degenerate and shrink. This not only means you'll need to get your dentures re-adjusted but it also means dental implants become less and less of a future option to replace teeth due to the amount of bone required to place the implant becomes less and less.
Full arch dentures take up more space in the mouth than your normal teeth. Because of this, there is an adjustment period of time where you may notice difficulty in pronouncing certain words or talking in general. As dentures get re-adjusted and re-fitted, you may notice a difference in pronunciation and will have to make minor speech adjustments again.
Bulky & Uncomfortable
Dentures are typically not associated with comfort and although today's technology has made wearing full arch dentures more manageable, as you speak and chew, dentures exert their forces onto the gum bed below and tend to cause soreness to these sensitive tissues. Additionally, the bulk of having a denture in your mouth can cumbersome.