Full face snorkel mask had been well recommended for snorkeling and the best thing about the use of this mask is that it allows you to breathe both from your nose and mouth underwater so you need not have separate pieces for it.
These types of snorkel are less intrusive, more hygienic, and you will be more relaxed with one of these on, rather than constantly clenching your mouth, and they are a bit less constrictive for people with respiratory issues.
The concerns that are raised with the use of full face snorkel mask are due to the misuse of such equipment when it is supposed to be used according to its intended purpose such as recreational use or just floating on the surface and comfortably looking down onto the fishies.
The very common concern with full face snorkel mask is the CO2 build up, but the manufacturers now have already addressed this concern and are able to produce innovative solutions to make this equipment more reliable underwater with all its safety.
Therefore, when you are choosing to purchase a full face snorkel mask always remember that it is intended in general for relaxed snorkeling only and not made for freediving or extensive open water swimming, and to get the best choice try on the mask and breath in it on land, and make sure only the breathing part should fog up when you breath.
One important thing that you will also remember when purchasing a full face snorkel mask in order for you not to encounter any issues or problems when using it, is to make sure that it fits well about your face and that its breathing part also fits neatly over your mouth and nose.
The quality of the full face snorkel mask must be the top one and you have to be very wary of those that are out in the market, even on known online websites that are cheaper/knockoff models and imitations that have been the most cause of many safety-compromising issues about full face snorkel mask.
It would be preferable that you make a good research and gather the most detailed info about the features of the mask, where it came from or manufactured and do not settle quality over the price, it would even be more advisable to purchase those expensive types especially if you are going to use this often as you can guarantee about its safety too.