Why can't you see my teeth when I smile?

Hi and thank you for your question! Lips naturally look thinner when smiling and it should not be a concern on its own and the more important aspect is the balance between lips and the rest of facial features. However, we always can add a little bit of volume to the lips with filler injection to achieve a fuller look at rest and while smiling. I hope it helps and good luck! 

Thank you for your question. Lip augmentation can increase your lip volume to work in conjunction with your smile and other features. I suggest that you consult with a board certified facial plastic surgeon.
Best wishes,

 Hi!
Thank you so much for the question. 
 There are two different things in your question:
First when you smile and your upper lip is thinner, and that can easily be addressed by adding some volume to your lips using lip fillers
 Secondly, as you brought up when you smile not much of your teeth are being shown. For that aspect there are some available methods however it needs more detailed physical exam. So I highly recommend you see your cosmetic physician, so he or she can decide on the best method to help that.
Thank you physical exam. So I highly recommend you see your cosmetic physician, so he or she can decide on the best method to help that.
Thank you again and keep us posted :-)