Is 1.5mm augment Gineoplasty enough? (photo)

I assume he meant 1.5 cms not mms for your chin augmentation. While this will bring your chin forward it will not make your jawline 'way stronger' and chin augmentation does not affect any part of the jawline behind the chin.

You have an underdeveloped chin in need of bone grafting and
multidimensional augmentation in vertical, horizontal and anterior axes
(not just a sliding genioplasty at all).
It is true the vast majority of surgeons use the implants instead of
the osseous surgery to adjust the chin, but this is a matter just of
lack of experience and comfort ease; implants play no role when there is
an autologous alternative which, actually, has plenty of superior
advantages.
Being an option, chin implants have serious disadvantages, especially
in the mid and long term, patients are rarely happy with them after 5-6
years, all are out sooner or later. A quick research just on this
website sheds light on the common, frequent and serious complications
and side effects chin implants entail, like dislocation, malpositioning,
infection, over or under corrections, visibility, fake looks, nerve
damage, chronic pain, poor aesthetic results and in general patients'
dissatisfaction; not to forget chin implants are not versatile, they are
unable to provide vertical increase, horizontal axis modifications and
in most cases sufficient anterior projection; as obvious as it sounds
but we have to bear in mind chin implants play absolutely no role when
the chin needs reduction of one of the spatial axes; actually it is very
common receiving patients who seek chin implant removal and replacement
by an osseous genioplasty in the same procedure.
Fillers, another tempting resource, are a very dangerous option in
chin reshaping, potentially destructive, unable to reshape and enhance
respecting the basic principles of anatomical beauty, leading to mid and
long term serious complications (granulomas, deformities, fistulae,
etc) and the worst is they can't be removed in most cases.
Burring the chin is, strictly said, osseous chin surgery but should
neither be performed, ever, since just flattens the chin by destroying
the natural dome of the jaw, deletes the labiomental crease and due to
the detachment of the mentalis tendon this technique commonly leads to a
droopy double chin, a serious aesthetic complication.
A multidimensional sliding genioplasty allows to a versatile surgeon
full customization for augmenting, reducing and leveling the chin in any
of its spatial axes, leading to a myriad of combinations to suit every
individual's chin anatomy and facial balance requirements; you can
masculinize, feminize, round or make square, increase, decrease, supply
bone graft, remove bone portions, slide fragments, etc. This absolutely
impossible with other method than multidimensional sliding geniplasty, a
technique providing a series of advantages among which worth
mentioning:
-lifetime procedure, no more revision or renewal procedures, unlike implants
-more natural than implants, the procedure is totally undetectable
-no visibility of implant edges during gestures, expression is even improved, nicer smile
-improves
the double chin effect at the sub-mental muscles (floor of mouth)
hammock caused by lack of tension there; also improves the shape and
tension of perioral muscles and tightens up the jowls, creating a
beneficial side effect in form of an indirect facelift and neck lift,
all patients see their face indirectly rejuvenated; implants do not
offer this feature
-no future displacements or neuritis of mental nerves
-no droopy double chin (the mentalis tendon is not detached)
-way lower rate of postoperative complications if compared with implants, like infections, displacements, neuritis, etc
-no
need for complex plates and screws or teeth braces that may need future
removal; just steel wires synthesis may suffice, they stay buried into
bone callus producing no disturbance
The cons for the patient are essentially the costs associated with
osseous genioplasties, however it sounds cheap if you consider the
lifetime benefits; obviously the main disadvantage happens on surgeon's
side, since it is more technically demanding than chin implants, few
surgeons are experienced or comfortable with multidimensional osseous
genioplasties (though I personally perform 100% of the chin procedures
by this osseous method); patients have difficulty in finding surgeons
experienced and comfortable in osseous genioplasties able to freely
modify the chin shape and size based on their aesthetic and gender
goals.
You'll find in this website hundreds of negative experiences with
chin implants in the short and mid term, do read my profile's Q&A
and you'll find them too. I am doing osseous genioplasties for more than
15 years with the highest success and no one patient sought afterwards
switching to chin implants, totally the opposite, I did many chin
implant removals and one-staged osseous genioplasties to replace the
implant and enhance the result.
See the link below to find few cases of my own practice very similar
to yours which I had the opportunity to operate successfully on, sharing
a lot of common features with the technical problem you have posted.
If you wish better grounded opinion well lit, focused and standard
images have to be assessed: frontal, both lateral and both oblique
views, also from underneath.
Feel free to request any additional information from me.

I think you should revisit that conversation with him.  Perhaps he meant 1.5 cm?  1.5mm is not worth doing a surgery. The amount the bone is advanced only shows about 70%.   I would probably advance you 8-10 mm which would look like 6-7 mm of movementA genioplasty will not change your jawline, except for the chinBest of luckDr Rodman