A dental bridge is usually used where there are fewer teeth to replace and the supporting teeth are strong enough to support the work load of the missing teeth. Full coverage bridges, as shown in the first animation, are used with caution due to the high incidence (approx.18%) of failure of one or other of these teeth. Resin retained bridges that involve much less preparation of the teeth, and consequently lower failure rates, are used in preference if possible.
A gap can also mean your 'bite' is affected, because the teeth next to the space can lean into the gap and alter the way the upper and lower teeth bite together. This can then lead to food getting packed into the gap, which causes both decay and gum disease.