<prompt> For optimum esthetics when setting maxillary denture teeth, the incisal edges of the maxillary incisors should follow the ___.Lower lips during smilingUpper lips during smilingLower lips when relaxedUpper lips when relaxed  <response>: Maxillary teeth should contact the wet dry lip line when fricative sounds f, v, and ph are made. These sounds help to determine the position of the incisal edges of the maxillary anterior teeth. 