Whats the difference between tooth decay and a cavity?!

Whats the difference between tooth decay and a cavity?

Well.. my brother just had his fillings, and now he sees a black spot on the side of his tooth that was worked on. I'm not really sure if its because the filling fell out.. or is it just tooth decay? Its a black spot, thats kinda like a circle that goes in a bit. and even if it were tooth decay.. don't they fill that in too? Please enlighten me :D thanks!

6 days ago
nope he got the white ones.. and yes joanne , I did search google already.. :P but I want to really make sure.. is it wrong to want to help my brother? ;\

Tooth decay and cavities are indeed the same thing. My guess is that your brother (if he had white fillings) either lost the filling from the side of the tooth or (more likely) he has a pit (normal developmental spot) on the side of the tooth that has become stained. It is also possible that the dentist put in a small silver filling (since that area is rarely seen) and that there and a white filling on the top of the tooth (which can be seen easily when the mouth is opened). If in doubt have the dentist or hygienist check it out, if it needs to be repaired the sooner the better. Good job in looking after your brother. Good luck!
JAMRDH - a dental hygienist