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staightening of the teeth facial growth guidance prof john mew biobloc stage 3 normal swallowing baby led weaning proper swallowing facial attractiveness biobloc stage 1 ALF appliance digestive and respiratory tract biobloc stage 2 choking purley push swallow Mew push swallow lsfo orthodontics swallowing muscles dr mike mew Frankel appliance london biobloc stage 4 musculature of swallowing epiglottis improper swallowing swallowing orthotropics mewing