Hi,I was sorry to hear that you are disappointed with your implants at the moment.Firstly I would strongly recommend that you wait until things have fully settled and you have lived with your implants for some time before you decide to undergo further surgery. I hope that with time you become used to your new size, and more confident about your new figure. I tend to find that when implants are placed under the muscle it can take up to 6 months for the muscle to finally relax and allow the implants to fall into their final position. I would therefore usually advise that you re-visit your plastic surgeon 6 months after surgery to review your decision.If you remain unhappy, you should consider the following points:When choosing size only YOU can really decide, whilst you may request the support and advice of your partner/family/plastic surgeon, if you do not request exactly what YOU want, then you are likely to be disappointed one way or the other (too small/too large).Choosing implant size is difficult - we do not yet have a computer program which will accurately demonstrate the final outcome for us. Looking at friends, or at pictures of other women, and trying to judge what size you need based on their outcome is even less satisfactory.Whilst plastic surgeons generally do not like to work in terms of cup size, and cannot guarantee a particular cup size, a general rule of thumb is that one cup size is approx. 100-150cc. Therefore, your 450cc implants were likely to have increased your cup size by three to four cups ie from a B to a DD/E cup. As it was, you went to a DD, so in your case, one cup size is approx 150cc. Therefore if you do decide to drop a cup size then a 300cc implant may be appropriate.When deciding upon the actual implant, the volume is only a part of the equation. Most plastic surgeons now also consider a 'biodimensional' approach to implant selection so that your chosen implant most suits your body frame. Your plastic surgeon will be able to discuss this further with you.If you are considering changing your implant, then you should be aware of the risks involved in any breast augmentation procedure. Whilst you did not experience any complications last time, and hopefully won't this time, you should be sure that dropping a size is worth the expense and the risk.Hopefully, in time you will grow to love your implants and not feel that any further surgery is necessary, but if you do decide to proceed, I hope it all turns out great and you finally get the breasts you were hoping forkind regards