David A. Kimmel, DMD

Cost. I am sure you can find some one to do this for less then $750. Thing is its like looking to have your car painted by looking at what the cost of a gallon of paint is.  Sure a chain 24 hr paint shop will do it for far less then the private shop around the corner. Both jobs will both look great at 60MPH but only one will look good in the drive way. Unlike painting cars injecting in the forehead is not without substantial risk. Frankly you aren't paying for the product as much as you are the experience and skill of the injector. 

This is nothing more then injecting filer using Ultra sound. The needles they use are coated to be more visible under ultrasound.  This really is an old technique used for guided injections of medications. Its a nice thing to do.  Is it necessary ? Very debatable and is just now gaining attention. Frankly finding a talented and experienced injector is far more important .

 Hyaluronidase does not hang around in the tissue for long. You are really just waiting for the inflammation you get with its use to go away. 2 weeks is a reasonable time. If however they have removed your HA because of granuloma formation or infection, waiting two months is a very good ideal. 

Smiles are so subjective. You have a nice smile and BoTox isn't going to give you a pleasing result.

It is a bit difficult to tell much from your photo as it is at a tilted angle. What I do see relates to the position of your gums over the right lateral tooth. If you look closely you find the gums did not fully recede from the tooth as it erupted. This is a very minor surgical procedure and can sometimes be done with a laser. Look for a Periodontist in your area and get  an evaluation.  

You look to be a really good case for the use of fillers . You can use a combination of lifting threads and smooth threads to treat this area but frankly you are going to get a much better result with fillers. 

Find an experienced injector and talk with them about your options in treating this area. Don't be surprised if they suggest filler not only in the tear trough but midface and cheeks as well.