I am not shure about the Mouth Prop (Bite Block) idea I may find it makes me feel a loss of control as I would be unable to close my mouth, although I can appreciate how it may help, particularly if a patient is undergoing a particularly long procedure where they have to keep their mouth open for a long time. If you were to read my journal I remember when I began my journey to overcoming my dental phobia in 1991, when I first saw Miss J.L Potter, how patient she was with me reassuring me and coaxing/encouraging me to open my mouth a little wider - bear in mind this was the first time I had seen a dentist for about 6/7 years. I haven't had any problems with opening my mouth during dental treatment. Fortunately I haven't had to undergoe any particularly long sessions of treatment, the longest appointment I have had so far was for about 45 minutes to have a wisdom tooth extracted and a scale and polish. My dentist Mrs Bekou - Betts started by giving me LA on the wisdom tooth to be extracted, then carried out the scale and polish whilst I was 'numbing up' then after finishing the scale and polish extracted the wisdom tooth. There were 'breaks' during the treatment so I could 'rest' close my mouth.