Pretty sure the snake teeth grow back fairly quickly unless I'm confusing them with my Axolotl ( they regenerate EVERY part of their body !) .
As regards the 'possible' teeth under your skin .... the area just got very tender suddenly after a week as the teeth had made their way to the surface .... pretty sure you can see them better if you run a needle over the affected area as they show up better ... or maybe mine were nearer the surface ....