Is a cleft a contraindication for treatment in the case of oral restrictions (such as a tongue or lip tie)?

A cleft, in any form, is not a contraindication for treatment.
If there is an oral restriction (such as a tight tongue or lip tie), treatment can provide better movement possibilities for the surrounding muscles and tissues that (depending on the type of cleft) determine the scar tissue.
Of course, treating the tongue or lip tie will not close the cleft itself, but it can contribute to smoother functioning of the tissues around it.
The better these muscles and tissues can move, the less tension arises, even after possible surgeries performed by the cleft team.
The Tongue Tie Clinic has already provided more functional space for several babies, children, and adults with a (current or previous) cleft, reducing compensatory behavior.