Sentence:  Ideally, the surgery is timed so that removal of the supernumerary tooth does not interfere with permanent tooth development. The earlier the <WSD>supernumerary</WSD> can be removed, however, the more likely it is that the permanent teeth will erupt normally. Surgery to remove a <WSD>supernumerary</WSD> is often complicated, especially if there are multiple supernumerary teeth or if access to the supernumerary tooth is limited. These patients are appropriately referred to a specialist. 
Meaning of the word marked with <WSD> tags:  Something which is beyond the prescribed or standard amount or number.