Board Thread:Questions and Answers/@comment-30088034-20170219194117/@comment-24821641-20170222210901

Sans cause me some resets too, 198 of them. I still beat him.

After a reset, Toriel will remember whether you chose butterscotch or cinnamon and if you tell her she's right she says she felt like she already knew you and that she often feels that about humans that fall. So yeah, they could reset, they just gave up eventually.