Is 421 Cc Enough Achieve D Cup?

420cc is a large implant, it all depends on what you are looking for. Without examining you I assume this implant will give you a large wow factor if that is what you are looking for

Hello! Thank you for your question. In
general, implant size does not
correlate with bra cup size. The cup size itself will vary from
manufacturer to manufacturer as well as who is doing the actual
measurements. Thus, cup size is never a reliable indicator for your
breast size. I typically encourage my patients not to communicate her
desires in cup size but more on the actual look and appearance. Given
your desires, a breast augmentation, with an implant or fat grafting,
would be an ideal procedure that would meet your expectations. Breast
augmentation is now the most popular procedure performed in plastic
surgery today. One tolerated very well by women with minimal downtime
and high patient satisfaction. Good
communication between you and your surgeon of your expectations is
warranted - choosing your surgeon wisely is the first step. Discussion

of your wishes and having an honest and open dialog of your procedure is
mandatory (e.g, implant type, incision, placement, etc). Your height,
weight, breast width, and body habitus will make a difference for which
implant style/projection to choose. Implant
profile will also make a difference on the projection, which will
influence overall breast/cup size. I have found

that photographs brought by the patient is helpful to get a
visualization of the appearance you wish for in terms of size, shape,
fullness, etc. In addition, your surgeon's pre and postoperative
photographs should demonstrate a realistic goal for you of results.
Sizers are helpful during an in-office consultation. Once this has
been accomplished, allow your surgeon to utilize his/her best medical
judgment during the procedure to finesse the best possible result for
you after preoperative biodimensional planning and fitting the right
implant for your breast width. This is the most important determinant
for the sizing of implants, which will provide the optimal result and
most aesthetically-pleasing result for you.Consult with a
board-certified plastic surgeon well-versed in breast procedures who
will examine and discuss with you the various options and factors to
consider and help you decide which one will be the right one for you.
Hope me that this helps! Best wishes for a wonderful result!

This would be a great question for your surgeon. If you don't have a surgeon yet go on a few consultations with board certified plastic surgeons and they should be able to help you decide on a size.