Are 750cc saline Implants too big for me?

You asked for my opinion, so I'll give it to you.  I think 750 cc's is much too large and advise against it.  They will make you look heavy.

750 cc implants are a significant size and have a tremendous weight to them. Over time this may become a problem. As we age our tissues do not handle weight of the implant well. The larger the size the higher the wright the more difficult it becomes to support the weight.  Axillary incisions are just fine as long as you have an experienced surgeon. One of the draw backs could be some numbness of the arm after the surgery from the  stretching of a few certain nerves.

First, I want to be clear that every individual has different anatomy and goals. A 750 cc implant is a very large implant. There are some people in which this would work out, but that is a very few. As an experienced revisionary breast surgeon, I see a lot of problems that occur with large implants. One of the problems I see is that patients will often say that they look fat when the implants are too large. Additionally, they complain that they can't wear certain clothes, they get negative attention, and they get neck pain and shoulder issues. Also, the larger your implants, the quicker they will droop. Gravity is always working. For these reasons, I would have a serious discussion with  your surgeon and not get hung up on a certain number of cc's. You had mentioned a transaxillary approach. The axillary approach works very well for saline implant because you can place them unfilled through a very small incision. If you place a large silicone implant, you need a much larger incision that negates the benefit of the armpit incision. If you are going with a large implant, you defenitely want to go with silicone because the larger the implant, the more your tissues are thinned and the more the wrinkling associated with saline will be apparent. I wish you luck in your decision.

  I would have to examine you to make a determination about size. I perform all approaches with all types of implants so that you can decide what you want.Kenneth Hughes, MDLos Angeles, CA

The best
cosmetic result in any particular breast augmentation patient depends on a
variety of factors, including: Your individual anatomy, realistic expectations,
a thorough discussion with the plastic surgeon about the options, and an
understanding of the pros and cons of any particular implant choice. Proper
sizing is not just about the number of cc’s. The thickness of your tissue,
breast dimensions which include the width,
height, and projection, as well as chest wall width all need to be considered
when choosing an implant. Trying on implant “sizers” of various shapes and
volumes while wearing a tight t-shirt, bra, or bathing sit at a preoperative
visit will help you and your surgeon choose the optimal implant.

There are no manufacturers' standards for cup sizing in the bra industry. The
cups of a 36 DD and a 40 DD are significantly different. Cup size varies from
manufacturer to manufacturer and even within styles from any particular
manufacturer.
While a 750 high profile implant is quite large, keep in mind that following the advice from a surgeon on this or any other
website who proposes to tell you exactly what to do without examining you,
physically feeling the tissue, assessing your desired outcome, taking a full
medical history, and discussing the pros and cons of each operative procedure
would not be in your best interest. I would suggest that your plastic surgeon
be certified by the American Board of Plastic Surgery and ideally a member of the
American Society for Aesthetic Plastic Surgery (ASAPS) that you trust and are
comfortable with. You should discuss your concerns with that surgeon in person.

Robert Singer, MD FACS

La Jolla, California

Thank you for the questions.  You are asking some excellent questions that online consultants cannot answer specifically enough to be truly helpful.   Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery (regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully.  Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals  with your plastic surgeon. This communication will be critical in determining  breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as  “natural” or "DD cup" etc means different things to different people and therefore prove unhelpful.
 Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup  size may also be inaccurate. The use of computer imaging may be helpful during the communication process.
3.  Once you feel you have communicated your goals clearly,  allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals.  Again, in my practice, this decision is usually made during surgery ( after the use of temporary intraoperative sizers).
I hope this, and the attached link (dedicated to  "larger" breast augmentation surgery concerns), helps.

I am always surprised how folks write to this site wanting information on what is needed or would be helpful in altering their looks without giving us any idea of what they look like.