Can a register dental assistant administrator botox?

The ability to inject Botox is not really the issue.  Each state has very specific laws governing the scope of practice anyone with a license is permitted to perform.  In my state dental assistants would not legally be allowed to perform Botox injections.  The bigger question is why would you choose to see a dental assistant for Botox injections?

Would you let a physician clean your teeth or fix your cavities? Whether a dental assistant CAN or CANNOT give Botox doesn't matter. The answer to who actually SHOULD give your Botox is clear.

Thank you for sharing your excellent question.  Regulations vary by state but no, a dental assistant can not administer Botox injections.  Hope this helps.

This is from the New Jersey Board of Denistry.  It does not permit dental assistants to administer Botox.13:30-2.4 SCOPE OF PRACTICE OF REGISTERED DENTAL ASSISTANT
a) A registered dental assistant may perform the following duties under the direct
supervision of a licensed dentist:1) Isolate the operative field, including the placement and removal of rubber dams;

2) Place and remove matrices and wedges;

3) Place temporary restorations;

4) Remove excess cement from crowns or other restorations and orthodontic
appliances;

5) Remove sutures;

6) Fabricate and cement temporary crowns and bridges after preparation of tooth (teeth)
by a dentist. This does not include intra-oral occlusal adjustment;

7) Etch teeth in preparation for bonding, sealants and desensitizing agents;
Place caries detecting agents;

8) Use instruments for caries detection. Such instruments shall not include lasers that
are capable of altering, cutting, burning or damaging hard or soft tissue;

9) Perform hand removal of soft temporary restorations;
Perform hand removal of crowns and bridges that have been temporarily cemented;
10) Prepare coronal surfaces for bonding and restoration, with pumice and water only,
not to include a prophylaxis;

11) Take alginate impressions;
Place amalgam, composite or gold foil in a tooth for condensation by the dentist;

12) Place and remove retraction cords and medicated pellets. This shall not include
electrosurgery or the use of lasers for tissue retraction;

13) Perform bite registration procedures;
Place and remove periodontal dressings and other surgical dressings;

14) Trial size (pre-select) orthodontic bands, wires, stainless steel crowns and temporary
crowns intra-orally or on diagnostic models;

15) Place and remove arch wires and ligature wires;

16) Take impressions for and perform laboratory fabrication of mouth guards. This shall
not include insertion of the appliance;

17) Make radiographic exposures as permitted by the Department of Environmental
Protection pursuant to N.J.S.A. 26:2D-24 et seq.;

18) Provide oral health education including dietary analysis and clinical instruction in
order to promote dental health;

19) Apply topical anesthetic agents;
Take and record vital signs;
Retract patient's cheek, tongue or other tissue parts during a dental procedure20)  Remove such debris as is normally created in the course of treatment during or after
dental procedures by vacuum devices, compressed air, mouthwashes and water;21)  Hold a curing light for any dental procedure. Such curing light shall not include a
laser capable of altering, cutting, burning or damaging hard or soft tissue or for
electrosurgery for tissue retraction;22) Take dental photographs including the use of intraoral cameras;23) Select shades of prosthetic appliances;24) Demonstrate home-use bleaching systems and apply bleaching agents;25) Apply hot or cold packs pursuant to the direction of a licensed dentist;26)  Administer a topical treatment on a patient after a licensed dentist or licensed dental
hygienist has performed. a prophylaxis;27) Assist a licensed dentist in the administration of nitrous oxide, provided the licensed
dentist is physically present in the operatory at all times during the procedure; and28) Provide prophylactic and preventive measures, such as the application of fluorides
and pit and fissure sealants and other recognized topical agents for the prevention of
oral disease or discomfort. This shall not include prophylaxis. 

N.J.A.C. 13:35-6.14B prohibits a physician from directing another person to inject a patient with a filler or neuromuscular blocker (Botox or Dysport) and requires that a physician only inject fillers and neuromuscular blockers.  This excludes RN, PA and NP from injecting.  Dental assistants fall under the dental board but dentists are allowed to inject botox only under certain restricted circumstances governed by the NJ Dental Board.
The proposed rules reflect the New Jersey State Board of Medical Examiners' current thinking and are used as their policy statement on the use of laser, and the administration of Botox and dermal fillers.