Teeth friendly alcohol drinks
Is quite reductive think that pH is the onlyfactor that determinate the health of your teeth, the content of carbohydrate have a strong effect too.
However in fact to my knowledge clear vodaka have one of the highest pH and very few carbohydrates so indeed is one of the most "teeth friendly alcohol drink".
These is take from Victor R. Preedy, Ronald Ross Watson Academic Press, 24/dic/2004 Comprehensive Handbook of Alcohol Related Pathology with the adding of Vodka and Coca Cola.

\begin{array}{|c|c|c|c|}\hline
Alcolic \space beverage &amp; Carboydrate \space content(\%) &amp; pH \\ \hline
Beer               &amp; 3.0-5.0   &amp;  4.1-4.5    \\ \hline
Wine &amp; 0.0-12.9 &amp;  2.8-3.8     \\ \hline
Sweet \space liquor           &amp; 30.0-31.0 &amp; 3.3-3.9 \\ \hline
Strong \space alcohol &amp; 0.0-1.2 &amp;   6.5-6.9\\ \hline
Vodka                &amp; very \space few       &amp; 6.0-7.0        \\ \hline
Coca Cola &amp; 10.6(?) &amp; 2.8\\ \hline
\end{array}

However keep out  from Vodka lemon!