What's the best option for better Jaw definition: Jaw or chin implant, sliding genioplasty, facelift/Venlay dentistry? (Photos)

Thanks for your question, its always difficult to know what is best, but you have great photos for this. Personally, i tend to like chin implants as they are easy, quick, effective and easy to remove if need be. also, you can shape them as needed by the patient. James Bonaparte

In my opinion your jawline shape is actually quite good.  Your best advice always will come form someone who can examine you in person, so I would take the advice of the dentist seriously.

Hello and thank you for your question. Based on your
photograph, a chin implant can be performed for
improved jaw line contour.  I always use a medpor implant with screw
fixation, which stays in place over time.  A silicone chin implant has a
high rate of malrotation over time.  Make
sure you specifically look at before and after pictures of real patients
who have had this surgery performed by your surgeon and not just a computer
animation system. The most important aspect is to find a
surgeon you are comfortable with. I recommend that you seek consultation with a
qualified board-certified plastic surgeon who can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

When  considering facial rejuvenation to achieve a more contoured chin and neck line it's important to consider the anatomic asymmetry or deficit which is focal to your concerns.  When searching for your ideal self it is important to be honest with yourself about the degree of deformity which you are hoping to achieve and the amount of effort or financial cost it will take to achieve your desired goals. Look for a  plastic Surgeon who is board certified and can show you before and after photos of your desired results. 

It is difficult to give you options without seeing your teeth and occlusion (how teeth come together).  Even though your teeth may be straight, it doesn't mean your bite is OK.  Based off your profile, I would assume you have an overbite/deep bite.  This is often due to the lower jaw being too far back.  I would suggest you see an orthodontist to evaluate your bite.  
If your bite is off because your lower jaw is too far back, a procedure to advance your jaw may be beneficial.  This is called orthognathic surgery. This will help to align the bite, give you more chin projection, and increase the height of your lower face.  You are simulating this when you put the tip of your tongue between your teeth.  It will also help with the deep crease below your lower lip.
If your bite is OK, than you could get a similar result from chin augmentation.  I would not recommend an implant in your case, because it may make the deep crease below your lip (labiomental sulcus) deeper.  A genioplasty advancement may be done to increase the height of your lower chin and bring it forward.
I would recommend against "face lift dentistry" for a variety of reasons.

Chin advancement is the ideal solution in my hands. Your bite is undisturbed in this procedure and most importantly, by moving the bone forward The muscles in the floor of the mouth are advanced with the bone to give a tighter submittal region.  Chin implants can look good but over time may erode underlying bone or become distorted.  They also mask the very subtle but beautiful nuances of the chin bone itself that advancement does not destroy

 When patients have a weak and  recessive Chin profile, then consider placement of a small chin implant to augment the chin forward, give additional width, and a small amount of vertical height. The soft tissues underneath the chin  are treated with a variety of techniques. The fat removal is accomplished with liposuction. To tighten the muscles  under the chin requires a platysma plasty.  For more information  and many examples, please see the link and the video below

Thank you for the question and I would go on some complimentary consultations with experts who use digital photography to show you what can be accomplished and how it might be done Dr Corbin

 Hi, I have performed many facial shaping procedures using dermal fillers, silastic facial implants (cheek, chin, lips), liposuction and/or facelifts for over 30 years.  From the photos, your cheeks are very flat in the front, the chin is weak and "jowls" are present in the lower face.  I can not comment on the merits of adding volume to the teeth however, this course of action "will not" approximate or mimic the results of a proper SMAS facelift with facial shaping of the cheeks and chin as described below.  If you are interested in non surgical options to create an enhanced, more feminine face you might consider augmentation of the cheeks and chin with a dermal filler. Following my beauty principles, women look the most feminine, youthful and attractive with heart shaped faces.  Heart shaped faces have cheeks that are full and round in the front.  Cheek augmentation with a dermal filler or using cheek implants for a permanent enhancement will create full, round cheeks that will feminize the entire face.
 I have performed many Chin Augmentations using chin implants for over 30 years.  From the photos, your chin is weak.  A weak chin creates an imbalance making the nose appear larger, the mid face top heavy and the lower face look short that de-emphasizes the lips and allows early formation of a double chin and "pseudo-jowls".   Pseudo jowls differ from "jowls" in what causes them, what they represent and how they are best treated.  Pseudo jowls are defined by a fold of tissue laxity that goes from the corners of the mouth to approximately 1/3 or 1/2 the distance to the lower jaw line.  It’s caused by a weak chin and its lack of tissue support around the chin and mouth area.  It's best treated by correcting of the weak chin with a silastic chin implant.  Jowls are described below in greater detail.  Chin augmentation using a chin implant will add projection to the chin creating harmony and balance to the lower face. 
 I have found that placement of a silastic chin implant, through a small curved incision under the chin (also allows excess skin removal) to be very safe, quick, highly effective and far less invasive than a sliding genioplasty.  I perform chin implant surgery in 30 minutes or less, often using a local anesthetic alone.  In my opinion, you are a good candidate for chin implant surgery.
  If you have "jowls” these are sagging facial tissues and the main indication for some form of a SMAS facelift.  The underlying SMAS layer, of the face, must be dissected, lifted, trimmed and re-sutured (not merely folded or suspended with threads or sutures that will not last).  The excess skin is then removed and the facelift incisions closed.
 My most popular SMAS facelift is the minimally invasive, short incision SMAS facelift that has all the benefits of more invasive facelifts (traditional, mid-face, deep plane, cheek lift and subperiosteal facelifts) but with these added benefits:
very small incisions and no incisions extend or are placed within the hair.
minimal tissue dissection = less bruising and swelling = rapid recovery ( several days instead of weeks or months with the more invasive type facelifts mentioned)
can be performed in 90 minutes or less, with or without general anesthesia
no incisions within the hair = no hair loss
excess fat can be removed from the face and neck
excess skin removed from the face and neck
cheeks, chin and jaw line can be augmented with dermal fillers (I prefer Restylane Lyft) or facial implants
most patients fly back home to parts all over the world in as little as 3 days post-op
 I combine facial shaping with every facelift procedure.  When jowls are present, these should be done in concert and not alone or separately in order to create a naturally, more attractive face.
Hope this helps.