After I had been smoking Meth for like three months, on a daily basis, my front teeth among other teeth, started rotting. I had to get lots of crowns (pretty much fake teeth) across the front of my mouth and 4 teeth removed from the back because they were too rotten... when my dentist first saw my teeth, the first thing he asked was if I had been doing Meth... made me feel really stupid! How embarrassing that they could tell I did Meth because my teeth were falling out of my face!!!