Tips for best angle while using the waterpik

I was asked to show how to get a better angle on the inside of the lower back teeth. I demo this with the waterpik of how to best get the 90° angle Click this link to purchase a waterpik: https://www.waterpik.com/products/dental-water-flosser/WP-670/ Click this link to purchase replacement tips: https://www.waterpik.com/tips-accessories/dental-water-flosser/counter-top/WP-660/ Happy water flossing 🦷😷