What are the consequences of having no teeth?

Serious and Many: Severe limitations with chewing, malnourishment, unclear speech, loss of enjoyment with eating, esthetic compromises, loss of youthful appearance, sunken facial features, loss of proper lip fullness, wrinkles around the mouth, shortening of the facial proportions, chin protrusion, social embarrassment, lowered attractiveness and sex appeal, social isolation often, depression, and many others.

Overclosure: If you have no teeth, you will causing your jaws to close farther than they normally would. This in turn can cause pain in the joints (TMJ) due to over closure. You may also notice a wetness and cracking in the corners of your mouth. You also need teeth for proper mastication of food. Without teeth, you will not be chewing your food properly which can lead to other digestive issues.