Not sure, but I think it is common to wear fitted mouthpieces with an extra on the helmet for style purposes.
The link below speaks to the style part, but doesn't make clear if mouthpieces are actually being worn.
https://wtop.com/washington-commanders/2...uthpieces/
The link below speaks to the style part, but doesn't make clear if mouthpieces are actually being worn.
https://wtop.com/washington-commanders/2...uthpieces/
