Dangers and Risks of Large Breast Implants?

When large implants are placed, predictable and bad changes occur, causing problems that may be unfixable.
The large implants require large dissection underneath the muscle (or worse under the breast). This creates a large "pocket".
Skin thins; it is just doing what it is told when a large foreign object is placed- thin out! Implants can actually protrude from the skin.
Nipples are much more likely to become numb from surgery.
Droopiness occurs much more quickly, requiring breast lifts in the future.
Revisional breast surgery in patients who have had very large implants in the past is very risky for complications, even in the best of hands.
The chance of revision surgery is much higher. The results of that revision surgery are far worse than for normal size implants. The internal pocket is simply huge, and the existing techniques for reducing the size of those capsules are weak.
The implant can erode into the ribs, causing a change in their shape.
The implants are no longer hidden by the natural breast tissue. They ripple more and show more, and are more palpable. Increased risk of loss of nipple sensation.
A double bubble problem can occur, where the implant and the silhouette of the old breast are simultaneously visible.
They can have the unintended consequence of making patients look "matronly" .
Stretch marks are common and untreatable.
If a pocket is made that is large, the muscle is often removed from the chest bone (sternum) and "jumps" when it is used. This problem is not usually fixable.
It is not uncommon to see women who have spent $60,000 plus total on their breasts after several revisional surgeries, and still don't look good.
Large implants are not a good idea.

Hi, the general consensus is that anything over 450-500 starts to be considered a large implant and a 650 is a significantly large and heavy implant especially with saline.
large implants have associated downsides like faster sagging and more skin thinning over time, not to mention weight. based on your height and weight, you can probably achieve your goal with a smaller silicone implant, but without a formal consultation by a qualified surgeon it is impossible to give accurate advise.

GIven your description of your frame, I would recommend a smaller sized implant, perhaps in the 400-500 cc range, to give you a dramatic improvement without overstretching your tissues. Once these tissues have been stretched out by very large implants, I think it is difficult to maintain a natural look to your breasts. Also, as you get a little older the tissues will thin, and then if you want to downsize the implants a bit, it will be very difficult to do so without adding the additional scars of a breast lift. If however you decide later on that you want to be a bit fuller, it is easy to do so through your existing incision without adding new ones.
In general, I advise my patients to be a bit more conservative than what you're describing. In the end, however, it's your body and your choice, as long as you and your surgeon have an honest discussion about the pros and cons of the implant choice, and you are willing to accept the possible risks.

Yes, this is a larger than average breast implant.
There are numerous increased risks associated with this, and I am sure I will not even touch on half of them, but consider the following.
The size of the implant has been associated with:

Increased risk of loss of nipple sensation
Increased risk for long term breast ptosis (sagging)
Increased risk for chest wall deformation (curving of the ribs)
Increased risk of rippling or palpable /visible creases
Increased risk of lower pole tissue attenuation (thinning of the tissues of the breast)
Increased risk of secondary revisionary procedures

These are a few of the risks off the top of my head. Please discuss with your surgeon.
Most importantly, remember that although you are seeking breast enlargement, many women present complaining of breast overgrowth desiring breast reduction. These women report limited physical activity, neck/back/shoulder pain, shoulder grooving from bra straps, numbness in the fingers, rashes beneath the breasts, etc.
Many of these women feel significant relief with reductions as small as 300 cc yet you are considering adding twice that to your breasts. Think it over carefully.
I hope this helps.

Thank you for the question. Yes, larger breast implants can be problematic (more so than smaller breast implants), both physically and psychosocially. Therefore, careful patient selection is key. On the other hand, some of my happiest and most grateful patients, our patients with “extra large” breast augmentation surgery. You may find the attached link, dedicated to “extra large” breast augmentation concerns, helpful to you as you learn more. Best wishes.