The alcohol percentage is not high.  It is normal for this type of product.  Also, the alcohol is designed to evaporate upon application.  It will dissipate within a few seconds of application, and ingestion would be negligible if any.
Every product is different.  Listerine uses alcohol as a solvent to dissolve essential oils.  Varnishes use alcohol as a solvent for the resin so it’s thin enough to apply with a brush, yet sticky enough to stay on teeth once applied.  This dictates how much alcohol is in a product.