The vast majority of patients report no effect on speech. However, as with traditional orthodontic appliances, there is an initial adjustment period associated with having something new in the mouth.
While Invisalign may inhibit speech initially, the tongue does adapt to the dental wear and speech will adjust accordingly. If the possibility of a lisp is stopping you from getting your teeth straightened, contact Dr. Allen for a consultation. She will listen to you, address your concerns and offer you the best solution for your particular situation.