Could explanting saline unders under local increase pec muscle deformity later?

Dear pinkgolden11,
it is hard to tell for sure without an examination. Generally speaking, as long as you don't have capsular contracture and your capsules are thin, you can get only implant removal. Most plastic surgeons don't reattach the muscle. If you are considering a surgery, I would suggest you to consult a board-certified plastic surgeon. Only after a thorough examination you will get more information and recommendations.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

The short answer is no, removing the implants will not deform the pectoralis muscle more and may actually improve the appearance of the pectoralis muscle and the animation deformity.

Removing breast implants can be performed under a local anesthetic and is a simple procedure with a quick recovery and return to work the next day. We are using a light sedation sublingual tablet that relaxes our patients for a brief time while the procedure is being performed. Dissolvable sutures are used and no drains are placed. Some women will substitute their own fat in the breasts instead of a breast implant, but this is a bigger procedure with the need for a general anesthetic.

Please consult with a Board Certified Plastic Surgeon who performs breast enhancement procedures frequently to assure the best possible result.

Good Luck!