I run a full face mask.... never had jaw issues with one of those
But for someone new, I do not recommend a full face, they are awesome, but if you have to ditch, you have to be totally comfortable and relaxed no matter what the conditions are and temp is, to get to your alt air source and put on a regular mask (kept in dry suit pocket)
But for someone new, I do not recommend a full face, they are awesome, but if you have to ditch, you have to be totally comfortable and relaxed no matter what the conditions are and temp is, to get to your alt air source and put on a regular mask (kept in dry suit pocket)