edge in , fit (in or into) , insert , insinuate , intercalate , interject , interpolate , interpose , intersperse , introduce , sandwich (in or between) , work in ;
The question really ought to be who should inject Botox. The laws vary from state to state as to who is allowed to inject and with what amount of supervision, but Botox is a powerful neurotoxin that can cause significant problems that don't readily resolve. As a controlled substance, injectors should be physicians or under the direct supervision of physicians when injecting. Beware of places where an MD has put their name on a medical spa, but is never seen in person. These places often are operating under his/her name only, not his/her supervision.