Simplify the following text for a Grade 5 native English-speaking person.
Original: The facing ( or lay ) is a curved section that leaves the flat table and continues to the tip of the mouthpiece . The length of a facing â '' defined as the distance from the tip of the mouthpiece to the point where the reed and mouthpiece meet â '' can vary .
Simplified: The facing ( or lay ) is the part of the reed that starts to curve around the end of the mouthpiece .