Lacuna has made it very clear, she wants Toots teeth, probably more so than any other teeth.
I am surprised Toot has not been able to persuade Lacuna to inspect his teeth close up, with her tongue. Given Lacuna’s anger at Harry’s rhyme, she has obviously considered this and is both repelled and attracted at the thought.
Now if Toot were to invest in a Tootbrush, some Tootpaste, dental floss, mouthwash and some celery, I am sure Lacuna would agree to a close up inspection, much to Toot’s joy.