Eva Notty Interesting situation here because she probably had one of the best boobjobs of all time and then one of the worst boobjobs of all time
Before [2004]:

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After (Part 1) [2007-2012]:

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After (Part 2) [2013-Present]: :sadkek:

SOFIA NIX This hot colombian chick went from perfection to looking like a failed ugly plastic bimbo sex doll. She had fantastic natural tits and a pretty face. Why would she destroy herself like that? She's done 8 BANGBROS scenes.
Pardon me in advance for the numerous pics. BEFORE :poggies: :monkax: :pepega:
Here's a video to prove that they were real before. I too had my doubts at first, but they indeed were natural tits. AFTER :kekw::ddhuh::hnng: :monkas::monkachrist::monkachrist::monkachrist::monkas:
I just stumbled upon this on Reddit : She now does camshows and what not. Here's her thread if you're interested in her NOW version :

Veronica Rayne Before:
After:

Chessie Kay Natural: [SIZE=1](there's so little content prior to her first implants I couldn't find a decent resolution picture, so I had to cut these clips out of her debut scene)[/SIZE]

First Boobjob: Second Boobjob: There was a brief period of maybe a year between her getting the bigger implants and having all her facial work done which (for me at least) was her peak.

Tiffany Mynx Before: After: [SIZE=1]Whilst the above pics are obviously from different eras in her career but I think they demonstrate quite well my personal opinion that tits, fake or otherwise, look best when they're in proportion to the rest of a women's body. If Tiffany had gotten her implants back as a "teen" in the 90s they wouldn't have looked anywhere near as good as they did once she'd gained some weight and age to balance them out. [/SIZE]

Angel Wicky - Her thread Before (circa 2010)

After (2011 onwards)

Honestly I was surprised she hadn't appeared in this thread already, but given that she's been around for getting on 15 years now and has been enhanced for almost all of that, I doubt many of her fans have ever even seen her pre-boobjob work.

Recent development.

DEMI SUTRA Before
After
LACEY DUVALLE Before
After

CHARILIE VALENTINE

LIA LIN

Heather Vahn Before:
After:

BUNNY MARTHY
BEFORE
AFTER

Eva Angelina

I can't believe this total smoke show hasn't made this list yet.
Before
After

Lana Analise Lady Ana Kali Rose Lily lou Aviana Violet

Alison Tyler who did a breast reduction