I am sorry to hear this. My question is, is this a "baby" tooth that fell out, or an adult tooth with root and all? I ask because sometimes baby teeth are retained and then fall out much later in life. If this tooth is an adult tooth although, I would not say this is normal. I would recommend a dental check-up to see what is the reason that it came out, such as a severe gum infection that caused this tooth to get loose and fall out naturally.