When it comes to designing tooth sizes in a smile line, there are many different factors to take into account. What is right? What is wrong? Where do you even begin? Well, hold onto your your dental mirrors because we're breaking down all things smile design. 

Let's break it down into bite-sized parts:

• Measure Twice, Smile Once: Whether it's the 22 mm rule from the vestibule or the 25 mm from the top of the philtrum, we're setting the stage for smile greatness. Mock up that central incisal edge and let the magic begin.

• The Sound of Success: Who knew F sounds could be so important? Check that new incisal edge position and make sure it's not playing hide-and-seek in the lower lip. We want our smiles to be heard loud and clear!

• Finding Your Smile Line: It's all about that upper incisal edge to lower lip harmony. Let's evaluate the smile position and make sure it's a match made in dental heaven.

• Width Matters: Measure the width of those centrals and determine their final width. Aim for that sweet spot between 8.5-8.9mm and watch those smiles light up the room!

• Math Made Chic: Divide central width by 0.75 and boom—you've got yourself the new upper incisor length.

• Gingival Glamour: Measure from the incisal edge mock-up to the gingival position and see if any gingival reductions are needed. It's all about those finishing touches.

• Mock-Up Madness: Get hands-on and start mocking up those centrals to the new width and height. And don't forget about the laterals—just 1mm shorter for that perfect balance.

• Canine Chic: Show those canines some love! Mock them up to the same incisal edge position as the centrals because every smile deserves a little sparkle.

• Bicuspids with Bite: Keep those first bicuspids' facial cusp position 1mm shorter than the canines.

• Remember: Dentistry is FUN!: Embrace the process, enjoy the journey, and don't forget to smile along the way. And hey, if you're not a fan of all those measuring steps, take a page out of Dr. David Hornbrook's book and just mock it up to make it look GOOD!

• Trust Your Instincts: If it looks right, you're probably pretty close. But if it looks wrong, well, it's definitely wrong! Trust your gut and let your creativity shine.

So there you have it, smile architects—a quick guide to designing new tooth sizes in a smile. Now go forth and create smiles that dazzle, because the world could always use a little more sparkle!

Let us know if you use this guide!