No tooth fairy

My 7 yrs old lost his front tooth yesterday. The other one is loose too and waiting for the moment to drop. This morning he woke up dissapointed because the tooth fairy ddnt come. He looked so sad and I told him maybe the tooth fairy is busy and will come again another day.  But how am I going to tell him TOOTH FAIRY is like SANTA CLAUS...they are not real. Will I break his tiny vulnerable heart, will this his first dissappointment? Furthermore,I hv to tell hm that we are muslim and we are not supposed to belief on tooth fairy or santa claus. How am I going to explain to him and not make him feel sad?  

My baby is not a baby anymore.

dont grow so fast, can?