I'm known to find the finishing touches of an actor's craft. Daniel Day-Lewis is one of the craftiest and I love to watch him make a scene. This time, he did it over and over again in Phantom Thread. I wonder why he decided that it was all about the teeth for Reynolds Woodcock. Maybe it's about the little human annoyances like scraping burnt toast or eating it inappropriately that sets the teeth on edge, but either way it was abundantly clear.
In theater, everything from a light to an outfit can speak volumes and are intended to. What's great and different about film is that subtle expressions get to join the cast. By moving all Woodcock's uptightness to the tooth and gum, Day-Lewis' brought out the orthodontist in an eccentric fashion expert and once again marked himself a master theater craftsman.